1181-47-1 2beta,4a,7-Trihydroxy-1-methyl-8-methylene-4aalpha,4bbeta-Gibb-3-ene-1alpha,10beta-dicarboxylic acid 1,4a-lactone, methyl ester, 2-acetate 7-trifluoroacetate 4aalpha,4bbeta-Gibb-3-ene-1alpha,10beta-dicarboxylic acid, 2beta,4a,7-trihydroxy-1-methyl-8-methylene-, 1,4a-lactone, methyl ester, 2-acetate 7-trifluoroacetate