InChI=1S/C15H22O3/c1-11(7-9-16)4-5-13-12(2)14(18)6-8-15(13,3)10-17/h4-5,7,16-17H,6,8-10H2,1-3H3/b5-4+,11-7+/t15-/m1/s1