2β,4aα-Dihydroxy-1β-methyl-8-methylenegibbane-1α,10β-dicarboxylic acid 1,4a-lactone

Gibbane-1,10-dicarboxylicacid, 2,4a-dihydroxy-1-Methyl-8-Methylene-, 1,4a-lactone, (1a,2b,4aa,4bb,10b)-

4Aalpha,4bbeta-gibbane-1alpha,10beta-dicarboxylic acid, 2beta,4A-dihydroxy-1-methyl-8-methylene-, 1,4A-lactone

(1alpha,2beta,4aalpha,4bbeta,10beta)-2,4a-dihydroxy-1-methyl-8-methylene-gibbane-1,10-dicarboxylic acid 1,4a-lactone