(E)-4-Methyl-7-(1-oxo-3-phenyl-2-propenyl)-2H-1,4-benzoxazin-3(4H)-one 123172-56-5 2H-1,4-Benzoxazin-3(4H)-one, 4-methyl-7-(1-oxo-3-phenyl-2-propenyl)-, (E)- BRN 5971815