Synonyms: 7,9a-Methano-9aH-cyclopenta[b]heptalen-11(10H)-one,dodecahydro-2,8,11a,12-tetrahydroxy-1,1,8-trimethyl-4-methylene-,(2S,3aS,4aS,7R,8R,9aR,11aR,12R)- (8CI);7,9a-Methano-9aH-cyclopenta[b]heptalene, grayanotoxan-6-one deriv.;6-Dehydrograyanotoxin II