InChI=1/C15H20O3/c1-8-5-4-6-15(3)11(16)7-10-9(2)14(17)18-13(10)12(8)15/h9-10,13H,4-7H2,1-3H3/t9-,10+,13-,15-/m1/s naphtho[1,2-b]furan-2,5(3H,4H)-dione, 3a,5a,6,7,8,9b-hexahydro-3,5a,9-trimethyl-, (3R,3aS,5aS,9bR)- rel-(3R,3aS,5aS,9bR)-3,5a,9-trimethyl-3a,5a,6,7,8,9b-hexahydronaphtho[1,2-b]furan-2,5(3H,4H)-dione