116337-83-8 2,2,4-Trimethyl-7-(2-methylene-1-oxobutyl)-2H-1,4-benzoxazin-3(4H)-one 2H-1,4-Benzoxazin-3(4H)-one, 7-(2-methylene-1-oxobutyl)-2,2,4-trimethyl- 7-(2-Methylene-1-oxobutyl)-2,2,4-trimethyl-2H-1,4-benzoxazin-3(4H)-one BRN 4320146