9-hydroxy-3,5a,9-trimethyl-3a,5,5a,9,9a,9b-hexahydronaphtho[1,2-b]furan-2,6(3H,4H)-dione InChI=1/C15H20O4/c1-8-9-4-6-14(2)10(16)5-7-15(3,18)12(14)11(9)19-13(8)17/h5,7-9,11-12,18H,4,6H2,1-3H naphtho[1,2-b]furan-2,6(3H,4H)-dione, 3a,5,5a,9,9a,9b-hexahydro-9-hydroxy-3,5a,9-trimethyl-