InChI=1S/C16H12O10S/c17-11-3-1-2-9(6-11)7-14(16(20)21)25-12-5-4-10(15(18)19)8-13(12)26-27(22,23)24/h1-8,17H,(H,18,19)(H,20,21)(H,22,23,24)/b14-7-