InChI=1S/C15H20O8S/c1-7-4-11(17)14-9(3)15(18)22-13(14)5-8(2)12(6-10(7)16)23-24(19,20)21/h5,10-14,16-17H,1,3-4,6H2,2H3,(H,19,20,21)/b8-5+