Title: 5-Methylcytosine CAS Registry Number: 554-01-8 CAS Name: 4-Amino-5-methyl-2(1H)-pyrimidinone Molecular Formula: C5H7N3O Molecular Weight: 125.13 Percent Composition: C 47.99%, H 5.64%, N 33.58%, O 12.79% Literature References: Occurs in a nucleic acid obtained from tubercle bacillus. Isoln: Johnson, Coghill, J. Am. Chem. Soc. 47, 2838 (1925). Synthesis from ethyl bromide addition product of thiourea and from ethyl formyl propionate: Wheeler, Johnson, Am. Chem. J. 29, 492 (1903). Properties: Prisms from water, may contain ½ mol H2O. mp 270° (effervescence). One gram dissolves in 29 ml water. Melting point: mp 270° (effervescence)

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