InChI=1S/C15H20O9S/c1-21-11-6-4-9(7-12(11)24-25(18,19)20)3-5-10-8-13(22-2)14(16)15(17)23-10/h4,6-7,10,13-14,16H,3,5,8H2,1-2H3,(H,18,19,20)