InChI=1/C15H14O9S/c16-10-2-1-7(3-12(10)18)15-13(19)6-9-11(17)4-8(5-14(9)23-15)24-25(20,21)22/h1-5,13,15-19H,6H2,(H,20,21,22)/t13-,15-/s2