InChI=1S/C15H20O8S/c1-7-4-12-14(9(3)15(18)22-12)13(23-24(19,20)21)5-8(2)11(17)6-10(7)16/h4,10-14,16-17H,2-3,5-6H2,1H3,(H,19,20,21)/b7-4+