N(4)-Hydroxycytidine

N(4)-Hydroxycytosine

N(4)-Hydroxydeoxycytidine triphosphate

N(4)-Methoxy-5-methylcytosine

N(4)-Methoxycytidine

N(4)-Methoxycytosine

N(4)-Methoxydeoxycytidine 5'-phosphate

N(4)-Methoxydeoxycytidine triphosphate

N(4)-Methyl-2'-deoxycytidine 5'-triphosphate

N(4)-Methyl-5-azacytidine

N(4)-Methylcytidine

N(4)-Methylcytosine

N(4)-Octadecyl-1-arabinofuranosylcytosine

N(4)-Oleoyl cytarabine

N(4)-Oleylcytosine arabinoside

N(4)-Palmitoyl cytarabine

N(4)-Succinyl-1-beta-D-arabinofuranosylcytosine

N(5)-(1-Carboxyethyl)ornithine

N(5)-(2'-Aminophenyl)-4-thioxohydantoic acid

N(5)-Ethyl-4a-hydroxy-3-methyl-4a, 5-dihydrolumiflavin