InChI=1S/C19H14O7S/c20-11-6-4-9(5-7-11)15-16-14-10(2-1-3-12(14)18-19(15)25-18)8-13(17(16)21)26-27(22,23)24/h1-7,13,18-20H,8H2,(H,22,23,24)