InChI=1S/C18H16O10S/c19-13-3-1-2-12(8-13)10-16(18(22)23)27-14-6-4-11(5-7-17(20)21)9-15(14)28-29(24,25)26/h1-9,16,19H,10H2,(H,20,21)(H,22,23)(H,24,25,26)/b7-5+