InChI=1S/C13H12O11S/c14-8-4-1-7(2-5-8)3-6-9(15)23-10(12(16)17)11(13(18)19)24-25(20,21)22/h1-6,10-11,14H,(H,16,17)(H,18,19)(H,20,21,22)/b6-3+