InChI=1S/C14H10O13S/c15-6-3-5(13(20)21)9(18)12(10(6)19)26-14(22)4-1-7(16)11(8(17)2-4)27-28(23,24)25/h1-3,15-19H,(H,20,21)(H,23,24,25)