InChI=1S/C18H14O8S/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/h1-4,6-9,15H,5,10H2,(H,20,21,22)