InChI=1S/C15H22O4/c1-8-4-5-11-10(3)15(18)19-14(11)6-9(2)13(17)7-12(8)16/h6,10-14,16-17H,1,4-5,7H2,2-3H3/b9-6+/t10-,11-,12+,13-,14-/m0/s1