text: In the IUPAC Red Book the following terms may be used for thiosulfate as a ligand: trioxido-1κO-disulfato(S—S)(2−); trioxidosulfidosulfato(2−); thiosulfato; sulfurothioato. In the naming for thiosulfate salts, the final "o" is replaced by "e". Thus, sodium aurothiosulfate could be called trisodium di(thiosulfato)aurate(I).