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6-(HYDROXYMETHYL)URACIL 2,4-Dihydroxypyrimidine-5-carboxylic acid dihydro-6-imino-1,3-dimethyluracil Pyrimidine-5-carboxaldehyde 4-AMINOPYRIMIDINE-5-CARBOXYLIC ACID Ethyl 4-amino-2-hydroxypyrimidine-5-carboxylate 5-Pyrimidinemethanol Cytosine 4-Pyrimidinamine, 5-methyl- (9CI) 2-HYDROXYPYRIMIDINE-5-CARBOXYLIC ACID