InChI=1S/C18H16O8S/c19-6-5-15(26-27(20,21)22)11-1-3-14-13(7-11)9-17(25-14)12-2-4-16-18(8-12)24-10-23-16/h1-4,7-9,15,19H,5-6,10H2,(H,20,21,22)