Cytosine
Cytosine (CAS: 71-30-7), with the molecular formula C4H5N3O and a molecular weight of 111.10 g/mol, is a pyrimidine derivative fundamental to nucleic acids. This white crystalline solid serves as a crucial building block in chemical synthesis, particularly for heterocyclic compounds. It is widely utilised in biochemical research and the development of pharmaceutical intermediates. Tech Serve Solutions supplies high-purity Cytosine for demanding research and synthesis applications.
- IUPAC
- 4-Amino-2-hydroxypyrimidine,4-Aminopyrimidin-2-(1H)-one
- Synonyms
- 4-Amino-2-hydroxypyrimidine4-Aminopyrimidin-2-(1H)-one

Nucleic Acid Research
As one of the four main nucleobases in DNA and RNA, cytosine is indispensable for research into genetics, molecular biology, and the study of DNA/RNA structure and function. Its role in genetic code dictates its importance in all life science research.
Chemical Synthesis Intermediate
Cytosine functions as a key starting material and intermediate in the synthesis of various organic compounds. Its pyrimidine structure makes it valuable for constructing complex heterocyclic molecules used in medicinal chemistry and materials science.
Pharmaceutical Development
This compound is employed in the early stages of pharmaceutical development, serving as a precursor for nucleoside analogues and other therapeutic agents. Research into antiviral and anticancer drugs often involves modifications of nucleobases like cytosine.
Biochemical Studies
Cytosine is used in a wide range of biochemical studies, including investigations into DNA methylation, epigenetics, and enzyme mechanisms involving nucleic acids. It provides a fundamental component for studying these vital biological processes.
| Molecular weight | 111.10 |
|---|---|
| Empirical formula | C4H5N3O |
| Assay | ≥99.0% (HPLC) |
| Melting point | >300 °C(lit.) |

Hazard statements
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Water hazard class (WGK, DE) | 1 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36/37/38 |
| Safety statements (S) | 26 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Cytosine (CAS 71-30-7) used for?
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Cytosine is primarily used as a fundamental building block in nucleic acids (DNA and RNA), in biochemical research, chemical synthesis, and as an intermediate in pharmaceutical development.
What are the CAS number and formula for Cytosine?
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The CAS number for Cytosine is 71-30-7, and its molecular formula is C4H5N3O.
What grade and purity does Tech Serve Solutions supply for Cytosine?
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Tech Serve Solutions supplies Cytosine with an assay of ≥99.0% (HPLC). We do not represent this product as USP, BP, EP, or other pharmacopoeia grades unless explicitly stated otherwise in the product documentation.
How should Cytosine be handled safely?
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Cytosine is classified as a Warning substance with hazards including skin irritation (H315), eye irritation (H319), and respiratory irritation (H335). Appropriate personal protective equipment, including a dust mask (N95 type), eyeshields, and gloves, should be used. Handle in a well-ventilated area or under a fume hood.
Is Cytosine a controlled substance?
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The provided data does not indicate that Cytosine (CAS: 71-30-7) is a controlled substance.
How is Cytosine packed and shipped by TSS?
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Tech Serve Solutions exports Cytosine globally. Packaging is designed to maintain product integrity during transit and is compliant with international shipping regulations. Specific packaging details can be provided upon request.
How can I request a quote or sample of Cytosine?
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To request a quote or a sample of Cytosine, please use the 'Request a Quote' or 'Request a Sample' form on our website, or contact our sales department directly with your inquiry, referencing product code 71-30-7.
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