2-Propenoic acid, 2-methyl-, 1a,2,3,5a,7,8,8a,9,10,10a-decahydro-3-hydroxy-4,10a-dimethyl-8-methylene-7-oxooxireno(5,6)cyclodeca(1,2-b)furan-9-yl ester, (1aR-(1aR*,3S*,4Z,5aR*,8aR*,9R*,10aR*))- 27542-17-2 Erioflorin Eriophyllum lactone A NSC 144151