3-(4-Methoxy­styryl)-2H-1,4-benzoxazin-2-one

The title compound, C₁₇H₁₃NO₃, a coumarin analog prepared from (E)-methyl 4-(4-methoxy­phenyl)-2-oxobut-3-enoate and 2-amino­phenol, has a planar conformation. Aromatic π-stacking interactions and C—H...O hydrogen bonds stabilize the crystal structure.

1-(p-Tolyl­sulfon­yl)-L-proline ethyl ester

The title compound, C₁₄H₁₉NO₄S, an inter­mediate for the synthesis of the penta­cyclic antitumour alkaloid camptothecin, has been crystallographically characterized. The crystal structure is stabilized by intra- and intermolecular hydrogen bonds.