guanine hydrochloride and its Impurities

The guanine nucleoside is called guanosine. Guanine is one of the four main nucleobases found in the nucleic acids DNA and RNA, the others being adenine, cytosine, and thymine. In DNA, guanine is paired with cytosine. Reference standards of Guanine Hydrochloride API,and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.