19906-72-0 Bakkenolid A Bakkenolide A FUKINANOLIDE Fukinanolid NSC292655 Spiro[furan-3(2H),2'-[2H]inden]-2-one, decahydro-3'a,4'-dimethyl-4-methylene-, [2'R-(2'.alpha.,3'a.alpha.,4'.alpha.,7'a.alpha.)]- Spiro[furan-3(2H),2'-indan]-2-one, 3'a,4,4',5,5',6',7',7'a.beta.-octahydro-3'a.beta.,4'.beta.-dimethyl-4-methylene-, (2'R)-