Methyl D-valinate hydrochloride7146-15-831 % similar 1,1′-[2-[2-(2-Amino-6-chloro-9H-purin-9-yl)ethyl]-1,3-propanediyl] diacetate97845-60-831 % similar Guanosine 5′-diphosphate disodium salt7415-69-230 % similar