16541-19-8 18549-35-4 6-thioguanosine 5'-diphosphate 9beta-Ribofuranosyl-2-amino-6-mercaptopurine 5'-diphosphate Guanosine 5'-(beta-thio)diphosphate Guanosine 5'-(trihydrogen diphosphate), 6-thio- Thiogdp p(S)pg