InChI=1S/C19H20O7S/c1-12-15-10-13(4-3-9-20)5-7-16(15)25-19(12)14-6-8-17(18(11-14)24-2)26-27(21,22)23/h3-8,10-12,19-20H,9H2,1-2H3,(H,21,22,23)