5‐Acetyl‐6‐methyl‐3‐phenyl‐4‐thioxo‐3,4‐dihydro‐2H‐1,3‐oxazin‐2‐one

In the title compound, C 13 H 11 NO 3 S, the 1,3-oxazine ring is planar and makes an angle of 88.7 (2)° with the plane of the phenyl ring. Bond lengths involving the N atom indicate a small amount of delocalization of the N-atom lone pair into the ring