InChI=1S/C22H26N2O4S.C4H4O4/c1-15(25)28-20-21(16-9-11-17(27-4)12-10-16)29-19-8-6-5-7-18(19)24(22(20)26)14-13-23(2)3;5-3(6)1-2-4(7)8/h5-12,20-21H,13-14H2,1-4H3;1-2H,(H,5,6)(H,7,8)/b;2-1-/t20-,21+;/m1./s1