%0 Journal Article %T 13-Hydroxy-4,16-dimethyl-4,16-diazapentacyclo[12.3.1.01,5.05,13.07,12]octadeca-7(12),8,10-triene-6,18-dione %A J. Suresh %A K. Gurunathan %A R. Suresh Kumar %A S. Perumal %J Acta Crystallographica Section E %D 2009 %I International Union of Crystallography %R 10.1107/s1600536809015293 %X In the title compound, C18H20N2O3, the N-methylpiperidone ring adopts a chair conformation. The pyrrolidine ring and the five-membered cyclopentane rings adopt envelope conformations. The five-membered ring of the ninhydrin system adopts an envelope conformation with the central C atom deviating by 0.217 (1) from the mean plane through the other atoms. The molecular packing is characterized by intermolecular C¡ªH...O and intramolecular C¡ªH...O and O¡ªH...N interactions. %U http://scripts.iucr.org/cgi-bin/paper?S1600536809015293