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