InChI=1S/C15H22O6S/c1-8(2)11-7-14(21-22(18,19)20)9(3)12-6-13(17)10(4-5-16)15(11)12/h4,8,11-12,14-16H,3,5-7H2,1-2H3,(H,18,19,20)/b10-4+