4H-1,4-BENZOXAZINE-4-ACETIC ACID, 6-ACETYL-2,3-DIHYDRO-3-OXO-, METHYL ESTER 6-Acetyl-2,3-dihydro-3-oxo-4H-1,4-benzoxazine-4-acetic acid methyl ester 91119-95-8 BRN 4513791