organic compounds
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In the title compound, C8H9N3O4, there are two molecules in the asymmetric unit, one of which is in the zwitterionic form. The zwitterion contains an intramolecular N—HO hydrogen bond and the other molecule contains both an intramolecular N—HO and an intramolecular O—HO hydrogen bond. In the crystal, N—HO and N—HN hydrogen bonds link the molecules, formimg a two-dimensional network parallel to (10-1).
organic compounds
Open access
The title compound, C22H29NO4, a stemona alkaloid, is composed of two lactone rings (A and E), a six-membered ring (B), a pyrrole ring (C) and a seven-membered ring (D). The five-membered rings A and E exhibit envelope conformations (C atoms as flaps) while ring C is planar. Ring B exhibits a twist-chair conformation due to fusion with pyrrole ring C while ring D adopts a chair conformation. The junction between rings A and B is cis. In the crystal, weak C—HO interactions involving the two carbonyl groups, a methylene and a methyl group give rise to a three-dimensional network.