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