InChI=1S/C15H22O3/c1-8-10(16)5-9-6-15(18)7-13(2,3)12(17)11(15)14(8,9)4/h5,8,11-12,17-18H,6-7H2,1-4H3/t8-,11-,12+,14+,15+/m0/s1