4-(9-Anthr­yl)-1-(2,4-dimethoxy­phen­yl)spiro­[azetidine-3,9′-xanthen]-2-one

The title compound, C37H27NO4, crystallizes with two mol­ecules in the asymmetric unit. The β-lactam ring of each mol­ecule is very nearly planar, with maximum deviations of 0.001 (2) and 0.017 (2) Å in the two mol­ecules. The crystal structure is stabilized by inter­molecular C—H⋯O and C—H⋯N contacts, as well as by weak C—H⋯π inter­actions