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The title compound, 4-acetoxy-3-[1-(4-nitrophenyl)-3-oxobutyl]-2H-1-benzopyran-2-one, C21H17NO7, crystallized in the monoclinic system, space group P21/a, with cell constants a = 9.5505(13)A, b = 11.9546(11)A, c = 16.336(2)A, β = 97.497(12)°, V = 1849.2(4)A3 and Z = 4. The compound crystallized in the open-chain keto form and had only one asymmetric center at C 15.

Crystal Structure of 4-Acetoxy-3-[1-(4-nitrophenyl)-3-oxobutyl]-2H-1-benzopyran-2-one