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Crystal structure of N-(tert-but-oxy-carbon-yl)glycyl-(Z)-β-bromo-dehydro-alanine methyl ester [Boc-Gly-(β-Br)((Z))ΔAla-OMe]. N-(叔丁基氧碳基)甘酰基-(Z)-β-溴脱氢丙氨酸甲酯的晶体结构[Boc-Gly-(β-Br)((Z))ΔAla-OMe]。
IF 0.9
Acta crystallographica. Section E, Structure reports online Pub Date : 2014-11-29 eCollection Date: 2014-12-01 DOI: 10.1107/S1600536814025677
Paweł Lenartowicz, Maciej Makowski, Bartosz Zarychta, Krzysztof Ejsmont
{"title":"Crystal structure of N-(tert-but-oxy-carbon-yl)glycyl-(Z)-β-bromo-dehydro-alanine methyl ester [Boc-Gly-(β-Br)((Z))ΔAla-OMe].","authors":"Paweł Lenartowicz,&nbsp;Maciej Makowski,&nbsp;Bartosz Zarychta,&nbsp;Krzysztof Ejsmont","doi":"10.1107/S1600536814025677","DOIUrl":"https://doi.org/10.1107/S1600536814025677","url":null,"abstract":"<p><p>The title compound, C11H17BrN2O5, is a de-hydro-amino acid with a C=C bond between the α- and β-C atoms. The amino acid residues are linked trans to each other and there are no strong intra-molecular hydrogen bonds. The torsion angles indicate a non-helical conformation of the mol-ecule. The dipeptide folding is influenced by an inter-molecular N-H⋯O hydrogen bond and also minimizes steric repulsion. In the crystal, mol-ecules are linked by strong N-H⋯O hydrogen bonds, generating (001) sheets. The sheets are linked by weak C-H⋯O and C-H⋯Br bonds and short Br⋯Br [3.4149 (3) Å] inter-actions. </p>","PeriodicalId":7117,"journal":{"name":"Acta crystallographica. Section E, Structure reports online","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2014-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1107/S1600536814025677","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"32945359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Crystal structure of methyl 1-methyl-3,5-diphenyl-7-tosyl-3,6,7,11b-tetra-hydro-pyrazolo-[4',3':5,6]pyrano[3,4-c]quinoline-5a(5H)-carboxyl-ate. 1-甲基-3,5-二苯基-7-甲酰基-3,6,7,11b-四氢吡唑啉-[4'，3':5,6]吡喃[3,4-c]喹啉-5a(5H)-羧酸甲酯的晶体结构。
IF 0.9
Acta crystallographica. Section E, Structure reports online Pub Date : 2014-11-29 eCollection Date: 2014-12-01 DOI: 10.1107/S160053681402515X
Eswar Kumar Nadendla, G Jagadeesan, D Kannan, Mannickam Bakthadoss, K Gunasekaran
{"title":"Crystal structure of methyl 1-methyl-3,5-diphenyl-7-tosyl-3,6,7,11b-tetra-hydro-pyrazolo-[4',3':5,6]pyrano[3,4-c]quinoline-5a(5H)-carboxyl-ate.","authors":"Eswar Kumar Nadendla,&nbsp;G Jagadeesan,&nbsp;D Kannan,&nbsp;Mannickam Bakthadoss,&nbsp;K Gunasekaran","doi":"10.1107/S160053681402515X","DOIUrl":"https://doi.org/10.1107/S160053681402515X","url":null,"abstract":"<p><p>In the title compound, C35H31N3O5S, the piperidine ring adopts an envelope conformation, with the methine C atom as the flap, and the pyran ring adopts a sofa conformation. The mean planes of these two rings are almost normal to one another, making a dihedral angle of 85.96 (5)°. The two phenyl rings, one attached to the pyrazole ring and the other to the pyran ring, are inclined to one another by 65.41 (11)°. They are inclined to the mean planes of the rings to which they are attached by 12.59 (11) and 70.09 (9)°, respectively. There is an intra-molecular C-H⋯π inter-action involving the tosyl-ate methyl group and the phenyl ring attached to the pyrazole ring. In the crystal, mol-ecules are linked by C-H⋯π inter-actions, forming ribbons parallel to (10-2). The ribbons are linked by slipped parallel π-π inter-actions involving inversion-related pyrazole rings [inter-centroid distance = 3.672 (2) Å], forming slabs parallel to (001). A preliminary report of this structure has been published [Bakthadoss et al. (2014 ▶). Eur. J. Org. Chem. pp. 1505-1513]. </p>","PeriodicalId":7117,"journal":{"name":"Acta crystallographica. Section E, Structure reports online","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2014-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1107/S160053681402515X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"32946137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Crystal structure of 2-hy-droxy-imino-2-(pyridin-2-yl)-N'-[1-(pyridin-2-yl)ethyl-idene]acetohydrazide. 2-羟基亚胺-2-(吡啶-2-基)- n '-[1-(吡啶-2-基)乙基]乙酰肼的晶体结构。
IF 0.9
Acta crystallographica. Section E, Structure reports online Pub Date : 2014-11-29 eCollection Date: 2014-12-01 DOI: 10.1107/S1600536814025793
Maxym O Plutenko, Rostislav D Lampeka, Matti Haukka, Ebbe Nordlander
{"title":"Crystal structure of 2-hy-droxy-imino-2-(pyridin-2-yl)-N'-[1-(pyridin-2-yl)ethyl-idene]acetohydrazide.","authors":"Maxym O Plutenko,&nbsp;Rostislav D Lampeka,&nbsp;Matti Haukka,&nbsp;Ebbe Nordlander","doi":"10.1107/S1600536814025793","DOIUrl":"https://doi.org/10.1107/S1600536814025793","url":null,"abstract":"<p><p>The mol-ecule of the title compound, C14H13N5O2, is approximately planar (r.m.s deviation for all non-H atoms = 0.093 Å), with the planes of the two pyridine rings inclined to one another by 5.51 (7)°. The oxime group is syn to the amide group, probably due to the formation of an intra-molecular N-H⋯N hydrogen bond that forms an S(6) ring motif. In the crystal, mol-ecules are linked by pairs of bifurcated O-H⋯(O,N) hydrogen bonds, forming inversion dimers. The latter are linked via C-H⋯O and C-H⋯N hydrogen bonds, forming sheets lying parallel to (502). The sheets are linked via π-π stacking inter-actions [inter-centroid distance = 3.7588 (9) Å], involving the pyridine rings of inversion-related mol-ecules, forming a three-dimensional structure. </p>","PeriodicalId":7117,"journal":{"name":"Acta crystallographica. Section E, Structure reports online","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2014-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1107/S1600536814025793","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"32946969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Crystal structure of 1-(piperidin-1-yl)butane-1,3-dione. 1-(胡椒碱-1-基)丁烷-1,3-二酮的晶体结构。
IF 0.9
Acta crystallographica. Section E, Structure reports online Pub Date : 2014-11-29 eCollection Date: 2014-12-01 DOI: 10.1107/S1600536814025768
Markus Schwierz, Helmar Görls, Wolfgang Imhof
{"title":"Crystal structure of 1-(piperidin-1-yl)butane-1,3-dione.","authors":"Markus Schwierz,&nbsp;Helmar Görls,&nbsp;Wolfgang Imhof","doi":"10.1107/S1600536814025768","DOIUrl":"https://doi.org/10.1107/S1600536814025768","url":null,"abstract":"<p><p>In the title compound, C9H15NO2, the piperidine ring exhibits a chair conformation. The butane-dione subunit exhibits a conformation with the ketone C atom in an eclipsed position with respect to the amide carbonyl group. In the crystal, a two-dimensional layered arrangement is formed by hydrogen bonds of the C-H⋯O type between the methyl group and the exocyclic methyl-ene unit as donor sites and the amide carbonyl O atom as the acceptor of a bifurcated hydrogen bond. These layers are oriented parallel to the ab plane. </p>","PeriodicalId":7117,"journal":{"name":"Acta crystallographica. Section E, Structure reports online","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2014-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1107/S1600536814025768","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"32946138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Crystal structure of 3-amino-1-propyl-pyridinium bromide. 3-氨基-1-丙基溴化吡啶的晶体结构。
IF 0.9
Acta crystallographica. Section E, Structure reports online Pub Date : 2014-11-29 eCollection Date: 2014-12-01 DOI: 10.1107/S1600536814025665
P Venkatesan, V Rajakannan, S Thamotharan
{"title":"Crystal structure of 3-amino-1-propyl-pyridinium bromide.","authors":"P Venkatesan, V Rajakannan, S Thamotharan","doi":"10.1107/S1600536814025665","DOIUrl":"10.1107/S1600536814025665","url":null,"abstract":"<p><p>The title mol-ecular salt, C8H13N2 (+)·Br(-), crystallizes with two independent 3-amino-pyridinium cations and two bromide anions in the asymmetric unit (Z' = 2). In the pyridine ring, the N atom is alkyl-ated by a propyl group. The dihedral angle between the mean planes of the pyridinium ring and the propyl group is 84.84 (2)° in cation A, whereas the corresponding angle is 89.23 (2)° in cation B. In the crystal, the anions and cations are linked via N-H⋯Br and C-H⋯Br hydrogen bonds, forming chains propagating along [100]. </p>","PeriodicalId":7117,"journal":{"name":"Acta crystallographica. Section E, Structure reports online","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2014-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1107/S1600536814025665","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"32946968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Crystal structure of bromido-fac-tricarbon-yl[5-phenyl-3-(pyridin-2-yl)-1H-1,2,4-triazole-κ(2) N,N']rhenium(I). 溴代三碳基[5-苯基-3-(吡啶-2-基)- 1h -1,2,4-三唑-κ(2) N,N']铼(I)的晶体结构
IF 0.9
Acta crystallographica. Section E, Structure reports online Pub Date : 2014-11-29 eCollection Date: 2014-12-01 DOI: 10.1107/S1600536814025604
Kseniia Piletska, Konstantin V Domasevitch, Alexander V Shtemenko
{"title":"Crystal structure of bromido-fac-tricarbon-yl[5-phenyl-3-(pyridin-2-yl)-1H-1,2,4-triazole-κ(2) N,N']rhenium(I).","authors":"Kseniia Piletska,&nbsp;Konstantin V Domasevitch,&nbsp;Alexander V Shtemenko","doi":"10.1107/S1600536814025604","DOIUrl":"https://doi.org/10.1107/S1600536814025604","url":null,"abstract":"<p><p>In the title compound, [ReBr(C13H10N4)(CO)3], the Re(I) atom has a distorted octa-hedral coordination environment. Two N atoms of the 5-phenyl-3-(pyridin-2-yl)-1H-1,2,4-triazole ligand and two of the three carbonyl groups occupy the equatorial plane of the complex, with the third carbonyl ligand and the bromide ligand in the axial positions. The three carbonyl ligands are arranged in a fac configuration around the Re(I) atom. Mutual N-H⋯Br hydrogen bonds arrange mol-ecules into centrosymmetric dimers. Additional stabilization within the crystal structure is provided by C-H⋯O and C-H⋯Br hydrogen bonds, as well as by slipped π-π stacking inter-actions [centroid-to-centroid distance = 3.785 (5) Å], defining a three-dimensional network. </p>","PeriodicalId":7117,"journal":{"name":"Acta crystallographica. Section E, Structure reports online","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2014-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1107/S1600536814025604","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"32945356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Crystal structure of the inter-metallic compound SrCdPt. 金属间化合物SrCdPt的晶体结构。
IF 0.9
Acta crystallographica. Section E, Structure reports online Pub Date : 2014-11-29 eCollection Date: 2014-12-01 DOI: 10.1107/S1600536814025823
Fakhili Gulo, Jürgen Köhler
{"title":"Crystal structure of the inter-metallic compound SrCdPt.","authors":"Fakhili Gulo,&nbsp;Jürgen Köhler","doi":"10.1107/S1600536814025823","DOIUrl":"https://doi.org/10.1107/S1600536814025823","url":null,"abstract":"<p><p>The crystal structure of the title compound, strontium cadmium platinum, adopts the TiNiSi structure type with the Sr atoms on the Ti, the Cd atoms on the Ni and the Pt atoms on the Si positions, respectively. The Pt atoms form cadmium-centred tetra-hedra that are condensed into a three-dimensional network with channels parallel to the b-axis direction in which the Sr atoms are located. The latter are bonded to each other in the form of six-membered rings with chair conformations. All atoms in the SrCdPt structure are situated on a mirror plane. </p>","PeriodicalId":7117,"journal":{"name":"Acta crystallographica. Section E, Structure reports online","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2014-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1107/S1600536814025823","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"32945357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Crystal structure of N-(tert-but-oxy-carbon-yl)phenyl-alanylde-hydro-alanine isopropyl ester (Boc-Phe-ΔAla-OiPr). N-(叔丁基氧碳基)苯丙酰氢丙氨酸异丙酯(Boc-Phe-ΔAla-OiPr)的晶体结构。
IF 0.9
Acta crystallographica. Section E, Structure reports online Pub Date : 2014-11-29 eCollection Date: 2014-12-01 DOI: 10.1107/S1600536814025197
Paweł Lenartowicz, Maciej Makowski, Bartosz Zarychta, Krzysztof Ejsmont
{"title":"Crystal structure of N-(tert-but-oxy-carbon-yl)phenyl-alanylde-hydro-alanine isopropyl ester (Boc-Phe-ΔAla-OiPr).","authors":"Paweł Lenartowicz,&nbsp;Maciej Makowski,&nbsp;Bartosz Zarychta,&nbsp;Krzysztof Ejsmont","doi":"10.1107/S1600536814025197","DOIUrl":"https://doi.org/10.1107/S1600536814025197","url":null,"abstract":"<p><p>In the title compound, the de-hydro-dipeptide (Boc-Phe-ΔAla-OiPr, C20H28N2O5), the mol-ecule has a trans conformation of the N-methyl-amide group. The geometry of the de-hydro-alanine moiety is to some extent different from those usually found in simple peptides, indicating conjugation between the H2C=C group and the peptide bond. The bond angles around de-hydro-alanine have unusually high values due to the steric hindrance, the same inter-action influencing the slight distortion from planarity of the de-hydro-alanine. The mol-ecule is stabilized by intra-molecular inter-actions between the isopropyl group and the N atoms of the peptide main chain. In the crystal, an N-H⋯O hydrogen bond links the mol-ecules into ribbons, giving a herringbone head-to-head packing arrangement extending along the [100] direction. In the stacks, the mol-ecules are linked by weak C-H⋯O hydrogen-bonding associations. </p>","PeriodicalId":7117,"journal":{"name":"Acta crystallographica. Section E, Structure reports online","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2014-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1107/S1600536814025197","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"32945360","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Crystal structure of dimethyl 3,3'-[(3-fluoro-phenyl)methyl-ene]bis-(1H-indole-2-carboxyl-ate). 二甲基3,3'-[(3-氟苯基)甲基]双-(1h -吲哚-2-羧酸酯)的晶体结构。
IF 0.9
Acta crystallographica. Section E, Structure reports online Pub Date : 2014-11-29 eCollection Date: 2014-12-01 DOI: 10.1107/S1600536814025756
Xin-Hua Lu, Hong-Shun Sun, Jin Hu
{"title":"Crystal structure of dimethyl 3,3'-[(3-fluoro-phenyl)methyl-ene]bis-(1H-indole-2-carboxyl-ate).","authors":"Xin-Hua Lu,&nbsp;Hong-Shun Sun,&nbsp;Jin Hu","doi":"10.1107/S1600536814025756","DOIUrl":"https://doi.org/10.1107/S1600536814025756","url":null,"abstract":"<p><p>In the title compound, C27H21FN2O4, the mean planes of the two indole ring systems (r.m.s. deviations = 0.0166 and 0.0086 Å) are approximately perpendic-ular to one another, making a dihedral angle of 87.8 (5)°; the fluorobenzene ring is twisted with respect to the mean planes of the two indole ring systems at 82.7 (5) and 85.5 (3)°. In the crystal, pairs of N-H⋯O hydrogen bonds link the mol-ecules into the inversion dimers, which are further linked by N-H⋯O hydrogen bonds into supra-molecular chains propagating along the b-axis direction. Weak C-H⋯π inter-actions are observed between neighbouring chains. </p>","PeriodicalId":7117,"journal":{"name":"Acta crystallographica. Section E, Structure reports online","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2014-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4257463/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"32945358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Crystal structure of bis-(1-benzyl-1H-1,2,4-triazole) perchloric acid monosolvate. 双-(1-苄基- 1h -1,2,4-三唑)高氯酸单溶剂的晶体结构。
IF 0.9
Acta crystallographica. Section E, Structure reports online Pub Date : 2014-11-26 eCollection Date: 2014-12-01 DOI: 10.1107/S1600536814024829
Yong-Qi Qin, Jin-Hui Xue, Yuan-Biao Qiao, Zi-Feng Zhang
{"title":"Crystal structure of bis-(1-benzyl-1H-1,2,4-triazole) perchloric acid monosolvate.","authors":"Yong-Qi Qin,&nbsp;Jin-Hui Xue,&nbsp;Yuan-Biao Qiao,&nbsp;Zi-Feng Zhang","doi":"10.1107/S1600536814024829","DOIUrl":"https://doi.org/10.1107/S1600536814024829","url":null,"abstract":"<p><p>The title compound, 2C9H9N3·HClO4, was prepared by reaction of 1-benzyl-1H-1,2,4-triazole and HClO4 in ethanol at room temperature. The asymmetric unit consists of two mol-ecules of 1-benzyl-1H-1,2,4-triazole and one of HClO4 mol-ecule. The benzene and triazole rings make dihedral angles of 85.45 (8) and 84.76 (8)° in the two mol-ecules. The H-atom position of the perchloric acid mol-ecule is split over two O atoms (real peaks on difference map), with site-occupation factors of 0.5. These H atoms form two classical hydrogen bonds [2.546 (5) and 2.620 (4) Å] with the same N atoms in both mol-ecules. Five inter-molecular non-classical C-H⋯O inter-actions, with C⋯O distances in the range 3.147 (5)-3.483 (5) Å, are found in the crystal structure. </p>","PeriodicalId":7117,"journal":{"name":"Acta crystallographica. Section E, Structure reports online","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2014-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1107/S1600536814024829","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"32946134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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