InChI=1S/C19H12O7S/c20-14-7-10-8-15-19(25-15)13-6-5-12(17(16(10)13)18(14)21)9-1-3-11(4-2-9)26-27(22,23)24/h1-8,15,19-20H,(H,22,23,24)