7-methoxy-3a,10b-dimethyl-1,2,3,3a alpha,5a alpha,7,10b beta,10c alpha-octahydro-4H,9H-furo(2,3',4':4,5)naphtho(2,1-c)pyran-4,9-dione
7-methoxy-3a,10b-dimethyl-1,2,3,3a alpha,5a alpha,7,10b beta,10c alpha-octahydro-4h,9h-furo(2,3',4':4,5)naphtho(2,1-c)pyran-4,9-dione