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