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The title compound, C18H16O8, was isolated from the plant Artemisia baldshuanica Krasch et Zarp. The mol­ecule is approximately planar, with the exception of the terminal methyl groups, the C atoms of which devitate from their attached ring planes by 1.243 (5) and 1.168 (5) Å. The dihedral angle between the substituted benzopyran and benzene rings is 5.8 (1)°; this near planarity could be due to conjugation or a packing effect. Intra­molecular O—H...O and C—H...O hydrogen bonds occur. In the crystal, mol­ecules are connected by O—H...O hydrogen bonds involving the hy­droxy and carbonyl groups, forming hydrogen-bonded chains along [001] and [1-10]. The chains are linked by C—H...O inter­actions.

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The title mol­ecule, C12H11Cl3N2O2, contains planar quinazolin-4(3H)-one (r.m.s. deviation = 0.0257 Å) and propyl fragments, forming a dihedral angle of 10.4 (2)°. An intra­molecular O—H...N hydorgen bond occurs. In the crystal, O—H...O hydrogen bonds link the mol­ecules into an infinite chain running parallel to the b axis.

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The title compound, C19H20N2O·C2H5OH, is an ethanol solvate of an indol alkaloid which was extracted from the plant Vinca erecta. The fused piperidine ring adopts an approximate boat conformation and the pyrrolidine ring an envelope conformation with one of the methyl­ene C atoms at the flap. An intra­molecular N—H...O hydrogen bond forms an S6 ring motif. In the crystal, norfulorocurarine and ethanol mol­ecules are linked into a chain along the c-axis direction through N—H...O and O—H...N hydrogen bonds.

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The title mol­ecule, C12H12N2OS, is planar, with an r.m.s. deviation of 0.04 Å. In the crystal, the N atom adjacent to the carbonyl group is sp2-hybridized. The crystal structure is stabilized by π–π stacking inter­actions observed between thio­phene and pyrimidinone rings of c-glide-related mol­ecules [centroid–centroid distance = 3.9554 (13) Å] and by C—H...π inter­actions, forming an infinite chain along the c-axis direction.
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