InChI=1S/C15H22O4/c1-8-4-5-11-9(2)13(16)18-14-12(11)10(8)6-7-15(3,17)19-14/h4-5,8-12,14,17H,6-7H2,1-3H3/t8-,9-,10+,11-,12?,14+,15+/m1/s1