InChI=1S/C15H20O3/c1-8-12(16)6-11-9-4-5-10(13(17)18)15(8,11)7-14(9,2)3/h9-11H,1,4-7H2,2-3H3,(H,17,18)/t9-,10+,11-,15-/m0/s1