108964-33-6 115868-70-7 37589-80-3 GTP gamma S GUANOSINE 5'-O-(3-THIOTRIPHOSPHATE) Guanosine 5'-(gamma-S)triphosphate Guanosine 5'-(trihydrogen diphosphate), P'-anhydride with phosphorothioic acid gamma-Thio-GTP