2,10-Dihydroxy-13-methyl-13-azatetracyclo[9.3.1.02,10.03,8]pentadeca-3(8),4,6-triene-9,15-dione

In the title compound, C15H15NO4, the n-methylpiperidone ring adopts a chair conformation and both five-membered rings adopt a twist conformation. An intramolecular O—H⋯O hydrogen bond is observed. Inversion-related molecules are linked into R 2 2(10) dimers by pairs of O—H⋯O hydrogen bonds. The crystal structure is further stabilized by C—H⋯O hydrogen bonds.