InChI=1S/C19H14O6S/c20-17-13(25-26(21,22)23)9-11-7-4-8-12-14(11)16(17)15(19-18(12)24-19)10-5-2-1-3-6-10/h1-8,13,18-19H,9H2,(H,21,22,23)