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.