addenda and errata
organic compounds
The title compound, C27H22N2O3, comprises an indeno-quinoxaline system linked via a spiro ring junction to a hexahydro-1H-pyrrolizine unit. This in turn carries an indene-1,3-dione linked again by a spiro junction through the five-membered indenone ring. The pyrrolizidine moiety is folded and twisted about the N—C bond common to the two five-membered rings. In the crystal packing, an R22(20) graph set involves a dimeric C—HO hydrogen bond and ring motif. The packing is further stabilized by C—HO and weak π–π interactions.
organic compounds
The pyrrolidine ring of the title compound, C34H32N4O2S, adopts an envelope conformation. The packing is stabilized by intermolecular C—HO and N—HN interactions.