17670-19-8 2-Amino-6-mercapto-9-ribofuranosylpurine 5'-triphosphate 29983-83-3 6-Mercapto-GTP 6-Thioguanosine 5'-triphosphate 9beta-D-Ribofuranosyl-2-amino-6-mercaptopurine 5'-triphosphate Guanosine 5'-(tetrahydrogen triphosphate), 6-thio- S6-GTP Thiogtp