5-benzofuranacetic acid, 6-ethenyl-2,4,5,6-tetrahydro-3,6-dimethyl-alpha-methylene-2-oxo-, methyl ester InChI=1/C16H18O4/c1-6-16(4)8-13-11(9(2)15(18)20-13)7-12(16)10(3)14(17)19-5/h6,8,12H,1,3,7H2,2,4-5H methyl 2-(3,6-dimethyl-2-oxo-6-vinyl-2,4,5,6-tetrahydro-1-benzofuran-5-yl)acrylate