2-Propenoic acid, 2-methyl-, 1a,2,3,5a,7,8,8a,9,10,10a,-decahydro-4,10a-dimethyl-8-methylene-7-oxooxireno(5,6)cyclodeca(1,2-b)furan-3,9-diyl ester, (1aR-(1aR*,3S*,4Z,5aR*,8aR*,9R*,10aR*))- 50816-66-5 Erioflorin methacrylate