InChI=1S/C19H16O6S/c20-14-7-4-11(5-8-14)15-9-6-12-2-1-3-13-10-16(21)19(18(15)17(12)13)25-26(22,23)24/h1-9,16,19-21H,10H2,(H,22,23,24)