InChI=1S/C15H20O4/c1-6-4-9-8(7(2)14(17)18-9)5-15(3)10(6)11-12(19-11)13(15)16/h6,8-13,16H,2,4-5H2,1,3H3/t6-,8-,9+,10-,11-,12-,13+,15+/m1/s1