D 9166 (OTTO) 2′-Deoxyguanosine 5′-monophosphate sodium salt hydrate, ≥99% (HPLC) - used as a substrate of guanylate kinase(s) (EC 2.7.4.8) to form dGDP which upon phosphorylation to dGTP supports DNA biosynthesis. dGMP is use to study physiochemical characteristics of guanine based molecules.