Overview
Cytosine (CAS 71-30-7 ), also abbreviated as Cyt, is a pyrimidine nucleobase used as a biochemical building block and reference standard across life science and specialty chemical applications.
It serves as a key starting material in the synthesis of nucleosides, nucleotides, and pharmaceutical intermediates. In biotechnology and molecular biology, it is used in the production of nucleoside analogs.
Consistent purity is critical for downstream synthesis of antiviral or anticancer drug intermediates. Cosmetic formulators incorporate it into skin care preparations targeting hydration and cellular support.
The material leverages its affinity for biological systems in various formulations. It also functions as a reference compound and reagent-grade material for analytical laboratories conducting nucleic acid research.
Specialty chemical manufacturers use it as a heterocyclic intermediate in the synthesis of agrochemical and pharmaceutical active ingredients. It is supplied as a white crystalline powder in various quantities.
Packaging ranges from laboratory-scale to bulk industrial orders. Standard grades include reagent-grade and high-purity specifications meeting research and synthesis requirements for global manufacturers.
Certificates of analysis with HPLC purity data are typically provided for every batch. Material is available to meet pharmaceutical-grade sourcing criteria on request for regulated applications.
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Physical Properties
| Melting Point | 322.5 °C (decomp) |
| Boiling Point | 208.2°C (rough estimate) |
| Density | 1.562 g/cm³ @ Temp: Room temp |
| Appearance | White Solid |
| Color | White to slightly yellow |
| Form | Crystalline Powder |
| Water Solubility | soluble |
| Refractive Index | 1.5000 (estimate) |
| Log P | -1.962 (est) |
Safety & Handling
Warning GHS07 Hazard Statements H315 Causes skin irritation H319 Causes serious eye irritation H335 May cause respiratory irritation Precautionary Statements P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P264 Wash … thoroughly after handling. P271 Use only outdoors or in a well-ventilated area. P280 Wear protective gloves/protective clothing/eye protection/face protection. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P332+P317 Get emergency medical help. P337+P317 If eye irritation persists: Get medical advice/attention. Get emergency medical help. P362+P364 Take off contaminated clothing and wash it before reuse. P403+P233 Store in a well-ventilated place. Keep container tightly closed. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Trade & Regulatory
| HS Code | 29335900 |
| Storage Class | 11 - Combustible Solids |
| WGK (Germany) | 1 |
Other Names
Related Products
Chemical Properties
- CAS Number
- 71-30-7
- EC Number
- 200-749-5
- Mol. Weight
- 111.10
- HS Code
- 29335900
- Category
- Pigments & Colorants