InChI=1S/C15H20O3/c1-8(2)15-12(17)7-10-5-6-11(16)9(3)14(10,4)13(15)18-15/h7,9,11,13,16H,1,5-6H2,2-4H3/t9-,11+,13+,14+,15-/m0/s1