InChI=1S/C15H20O3/c1-8-12(16)5-11-10(13(17)18)4-9-6-14(2,3)7-15(8,9)11/h4,8-9,11H,5-7H2,1-3H3,(H,17,18)/p-1/t8-,9-,11+,15-/m1/s1