InChI=1S/C15H22O4/c1-9(14(18)19)11-5-6-15(2)12(11)4-3-10(8-16)7-13(15)17/h3,12-13,16-17H,4-8H2,1-2H3,(H,18,19)/b11-9+/t12-,13+,15-/m1/s1