Synonyms: Spiro[furan-2(3H),1'(2'H)-naphthalene],5-ethenyldecahydro-2',5,6',8'a-tetramethyl-5'-methylene-,(1'R,2'R,4'aS,5S,6'R,8'aS)-rel-(-)- (9CI);Spiro[furan-2(3H),1'(2'H)-naphthalene],5-ethenyldecahydro-2',5,6',8'a-tetramethyl-5'-methylene-, [1'a(R*),2'a,4'aa,6'a,8'ab]-(-)-; Rotalin A