InChI=1S/C17H20N2O9S/c20-14(21)8-7-12(16(23)24)18-15(22)10-3-5-11(6-4-10)29(27,28)19-9-1-2-13(19)17(25)26/h3-6,12-13H,1-2,7-9H2,(H,18,22)(H,20,21)(H,23,24)(H,25,26)/t12-,13+/m0/s1