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