5-Keto-8-Methylene coriolin B 8-Nonenoic acid, 5-oxo-, octahydro-2,7-dihydroxy-3a,5,5-trimethylspiro-(cyclopenta[4,5]pentaleno[1,6a-b]oxirene-3(3aH), 2'-oxiran-4-yl ester, (1a.alpha.,2.beta.,3.beta.,3a.beta.,3b.alpha.,4.alpha.,6a.alpha.,7.beta.,7ar)- 8-Nonenoic acid, 5-oxo-, octahydro-2,7-dihydroxy-3a,5,5-trimethylspiro[cyclopenta[4,5]pentaleno[1,6a-b]oxirene-3(3aH), 2'-oxiran]-4-yl ester, (1a.alpha.,2.beta.,3.beta.,3a.beta.,3b.alpha.,4.alpha.,6a.alpha.,7.beta.,7aR)- CORIOLIN B, 5-KETO-8-METHYLENE NSC293854