116337-82-7 2,4-Dimethyl-7-(2-methylene-1-oxobutyl)-2H-1,4-benzoxazin-3(4H)-one 2H-1,4-Benzoxazin-3(4H)-one, 2,4-dimethyl-7-(2-methylene-1-oxobutyl)- BRN 4323206