1H,10H-Furo(3',4':4a,5)naphtho(2,1-c)pyran-1,8(4bH)-dione,3-(3-furanyl)-3,4,4a,5,7a,11,12,12a-octahydro-4a-methyl-, (3R,4aR,4bR,7aR,10aS,12aS)-rel-(-)- 67927-55-3