3-(2-Methoxyphenyl)-1H-2-benzopyran-1-one

C16H12O3, Mr = 252.3, orthorhombic, Pna21, a = 6.633 (3), b = 13.367 (2), c = 14.056 (2) A, V = 1246.3 (9) A3, Z = 4, Dx = 1.344 g cm-3, lambda (Cu K alpha) = 1.54184 A, mu = 7.17 cm-1, F(000) = 528, T = 296 K, R = 0.027 for 2337 observations (of 2508 unique date). The average deviation from planarity is 0.013 (1) A with a maximum of 0.028 (1) A for the fused-rings system, and 0.003 (1) A with a maximum of 0.005 (1) A for the methoxyphenyl ring. The dihedral angle between the two systems is 4.7 (3) degrees. The methoxyphenyl ring is pushed away from the vinyl proton and towards the endocyclic O atom; the bond angles are 130.13 (9) and 110.13 (8) degrees, respectively.