134577-34-7 2H-1,4-Benzoxazin-3(4H)-one, 7-(2-methyl-1-oxo-propenyl)-2,2,4-trimethyl- 7-(2-Methyl-1-oxo-propenyl)-2,2,4-trimethyl-2H-1,4-benzoxazin-3(4H)-one BRN 4353950