InChI=1S/C18H14O11S/c19-12-4-1-11(8-15(12)29-30(25,26)27)9-16(18(23)24)28-14-5-2-10(7-13(14)20)3-6-17(21)22/h1-9,19-20H,(H,21,22)(H,23,24)(H,25,26,27)/b6-3+,16-9-