InChI=1S/C21H17NO9S2/c1-13-3-2-4-18-19(13)22-20(23)21(18,14-5-9-16(10-6-14)30-32(24,25)26)15-7-11-17(12-8-15)31-33(27,28)29/h2-12H,1H3,(H,22,23)(H,24,25,26)(H,27,28,29)