N-(2-Hydroxy­ethyl)-13c-meth­oxy-1-oxo-1,13c-dihydro­dibenzo[a,kl]xanthene-2-carboxamide

The title compound, C₂₄H₁₉NO₅, contains five fused rings, of which three are planar and the other two have twisted and flattened boat forms. The crystal structure is stabilized by intra- and inter­molecular N—H...O, O—H...O and C—H...O hydrogen bonds.