InChI=1S/C15H18O8S/c1-20-11-6-3-10(4-7-11)5-8-12-9-13(21-2)14(15(16)22-12)23-24(17,18)19/h3-8,12-14H,9H2,1-2H3,(H,17,18,19)/b8-5+