Guanine is used as an intermediate for acyclovir and 6-thioguanine. Guanine is on one of the five nucleobases incorporated into biological nucleic acids. Guanine, along with adenine and cytosine, is present in both DNA and RNA, whereas thymine is usually seen only in DNA, and uracil only in RNA.
|Appearance||White to almost white powder||Complies|
|Residue on ignition||≤0.1%||0.06%|
|Loss on drying||≤0.5%||0.3%|
|Related substance||Single impurity≤0.25%||0.01%|
|Appearance:||White to almost white powder|
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