Synonyms: Propanoicacid,2-[9-[(acetyloxy)methyl]-1a,1b,2,3,4a,6,8,8a,9,9a,10,10a,10b,10c,11,11b-hexadecahydro-2-hydroxy-1b,7,10b-trimethyl-3,6-dioxocyclopropa[4,5]cyclopropa[4',5']cyclopent[1',2':7,8]acephenanthryleno[10a,10-b]furan-4(1H)-ylidene]-,methyl ester, [1aR-(1aa,1bb,2b,4Z,4ab,4bS*,8aa,9a,9aa,10aa,10bb,10cb,11ba)]-; (-)-Shizukaol E; Shizukaol E