InChI=1S/C15H20O5/c1-7(2)9-3-4-10(15(19)20)13-11(9)5-8(14(17)18)6-12(13)16/h5,7,9-11,13H,3-4,6H2,1-2H3,(H,17,18)(H,19,20)/t9-,10+,11-,13-/m1/s1