English Name	Cytosine
Chinese Alias	4-Amino-2-hydroxypyrimidine; 2-Hydroxy-4-aminopyrimidine
CAS RN	71-30-7
Molecular Formula	C₄H₅N₃O
Molecular Weight	111.102
EINECS No.	200-749-5
Structural Formula
Technical Indicators of Cytosine (Pharmaceutical Intermediate)
Item	Quality Index
Property	White or off-white crystalline powder
Loss on Drying (%)	≤ 0.2
Residue on Ignition (%)	≤ 0.1
Identification	The retention time of the main peak of the test solution should be consistent with that of the reference solution (± 2.5%) under the content determination item
Uracil (%)	≤ 0.25
Maximum Unknown Single Impurity (%)	≤ 0.25
Total Impurities (%)	≤ 0.5
Purity (%)	≥ 99.5
Content (%)	98.0-102.0
Melting Point	＞300℃
Application	Used as a pharmaceutical intermediate
Packaging	Inner packaging: PE bag; Outer packaging: cardboard drum or packaging as per customer requirements
Transportation	Transportation tools must be clean and dry; protect from rain, moisture and sunlight during transportation; do not mix with toxic, harmful, corrosive and other polluting substances; handle with care during transportation and storage, no collision or bumping

Key Features

● High purity (≥ 99%), confirmed by HPLC and NMR analysis

● Stable crystalline form, easily soluble in mild acidic or basic conditions

● Low heavy metal and chloride residue content

Applications

● Raw material for cytidine and cytosine analogues synthesis

● Used in genetic engineering and nucleic acid research

● Intermediate for antiviral and antitumor agents