Abstract
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) angstrom from the mean plane through the other atoms. The molecular packing is characterized by intermolecular C H center dot center dot center dot O and intramolecular C-H center dot center dot center dot O and O-H center dot center dot center dot N interactions.