Molecular formula: C4H5N3O

Molecular weight: 111.10

Purity: 98.0% or higher

MDL number: MFCD00006034

Beilstein number: 2637

EC: 200-749-5

Melting point: > 300 ℃ (lit.)

Properties: white or white crystalline powder

Water loss at 100℃, brown at 300℃, decomposition at 320 ~ 325℃. 1g product can be dissolved in 130ml water, slightly soluble in ethanol, insoluble in ether. At pH2, the maximum absorption wavelength is 276nm, the molar absorption coefficient is 10000, and the minimum absorption wavelength is 238nm. The absorbance ratios A250/A260=0.48, A280/A260=1.53, and A290/A260=0.78. It's irritating.

Cytosine nucleoside and cytosine nucleotide can be used as drugs to increase leucocyte. Cytosine is an important intermediate in fine chemical industry, pesticide and medicine, especially in the field of medicine, which is mainly used to synthesize anti-aids drugs and anti-hepatitis drugs lamivudine, anticancer drugs gemcitabine, enotabine and 5-fluorouracil.