4H,9H-Furo(2',3',4':4,5)naphtho(2,1-c)pyran-4,9-dione,1,2,3,3a,5a,7,10b,10c-octahydro-2-hydroxy-3a,10b-dimethyl-, (2R,3aS,5aR,10bS,10cR)- 76236-26-5