InChI=1S/C15H22O4/c1-14(2)6-5-10(16)15-9(14)4-3-8-7-18-12(11(8)15)19-13(15)17/h3,9-13,16-17H,4-7H2,1-2H3/t9-,10-,11?,12+,13+,15?/m0/s1