Synonyms: Formamide,N-(2,6-diamino-1,4-dihydro-4-oxo-5-pyrimidinyl)- (6CI,9CI);2,4-Diamino-5-(formylamino)-6-hydroxypyrimidine;2,4-Diamino-5-formamido-6-hydroxypyrimidine;2,6-Diamino-4-hydroxy-5-formamidopyrimidine;2,6-Diamino-4-oxo-5-formamidopyrimidine;2,6-Diamino-5-formamido-4-hydroxypyrimidine; FAPy-guanine