thiosulfato-
combining form 
Etymology: thiosulfate + -o- 
 : containing the bivalent radical S2O3 characteristic of thiosulfates  — especially in names of coordination complexes
< sodium thiosulfatoaurate (I) Na3Au(S2O3)2 >
< sodium thiosulfatoaurate (I) Na3Au(S2O3)2 >