organic compounds
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In the title compound, C17H15NO, the benzene ring and the indole system are almost perpendicular, making a dihedral angle of 87.82 (6)°. The crystal packing is stabilized by C—HO and π–π stacking interactions with centroid–centroid distances of 3.592 (4) Å between the pyrrole and the benzene rings in the indole systems of neighboring molecules.
organic compounds
Open access
The title compound [systematic name: 3,3′,6,6′-tetrahydroxy-4,4′-dimethyl-1,1′-bi(cyclohexa-3,6-diene)-2,2′,5,5′-tetraone], C14H10O8, was isolated from Tremella fuciformis. The molecule has 2 symmetry, with the mid-point of the C—C bond linking the cyclohexadienedione rings located on a twofold rotation axis. In the molecule, the ring is approximately planar, with an r.m.s. deviation of 0.0093 Å, and the two rings make a dihedral angle of 67.89 (5)°. Intermolecular O—HO hydrogen bonding occurs in the crystal structure.
organic compounds
Open access
In dimethyl sulfoxide solvated 9-(2-carboxy-2-cyanovinyl)julolidine, C16H16N2O2·C2H6OS, the essentially planar -CH=(CN)-CO2H substituent (r.m.s. deviation = 0.014 Å) is almost coplanar with respect to the benzene ring, the dihedral angle between the two planes being 0.48 (2)°. The conformations of the fused, non-aromatic rings were found to be half-chair. In the crystal, the acid molecule forms a hydrogen bond to the O atom of the solvent molecule. The acid molecule is disordered over two positions with respect to the methylene C atoms in a 1:1 ratio. The crystal studied was found to be a racemic twin.