Cytosine 99% has been used:
for the preparation of nucleobase solutions[1]
as a standard for high-performance liquid chromatography (HPLC)
for the estimation of global methylation rate[2]
for nucleoside 5′-triphosphate (NTP) synthesis.
purification[3]
Chemical formula    C4H5N3O
Molar mass              111.10 g/mol.
Density            1.55 g/cm3
Boiling point          445.8ºC at 760 mmHg
Technical Analysis
Specification        Typical Values
Colour (APHA)          white
CAS NO.               71-30-7
Density 1.3±0.1 g/cm3
Solubility              (H2O, g/dl) 10.6(30°),14.1(52°),19.0(61°)
Cytosine 99 % is a pyrimidine that forms three hydrogen bonds to base pair with guanine. It has a molecular formula of C4H5N3O and a molecular weight of 111.10 g/mol. 
 
Sihauli Chemicals is one of the leading Cytosine 99 % Manufacturer and Exporter form India. Sihauli Chemicals SupplyCytosine 99 % to Asia, Africa, Europe, North & South America and Oceania.
Our Global Presense:
Asia: Bangladesh, Burma (Myanmar), China, Hong Kong (UK), Indonesia, Iran, Israel, Japan, Jordan, Kampuchea (Cambodia), Kuwait, Laos, Lebanon, Macao (Portuguese), Malaysia, Maldives, Mongolia, Nepal, Oman, Philippines, Qatar, Saudi Arabia, Singapore, South Korea, Sri Lanka, Taiwan, Thailand, Turkey, United Arab Emirates, Vietnam.
Europe: Albania, Andorra, Austria, Belgium, Bulgaria, Cyprus, Czechoslovakia, Denmark, Finland, France, German Democratic Republic, Gibraltar, Greece, Hungary, Iceland, Ireland, Italy, Liechtenstein, Luxembourg, Malta, Monaco, Netherlands, Norway, Poland, Portugal, Romania, San Marino, Spain, Sweden, Switzerland, United Kingdom, U.S.S.R., Yugoslavia. Africa: Algeria, Angola, Egypt, Ethiopia, Gabon, Ghana, Kenya, Liberia, Libya, Madagascar, Mauritius, Morocco, Mozambique, Namibia, Nigeria, Reunion (France), Seychelles, Somalia, South Africa, Sudan, Tanzania, Tunisia, Uganda, Zambia, Zimbabwe.
North America: Bahamas, Barbados, Bermuda, British Virgin Islands, Canada, Costa Rica, Cuba, Dominica, El Salvador, Greenland (Denmark), Grenada, Guatemala, Haiti, Honduras, Jamaica, Martinique, Mexico, Montserrat, Nicaragua, Panama, Puerto Rico (USA), St. Vincent & the Grenadines, Trinidad & Tobago, USA, Virgin Islands.
South America: Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, French Guiana, Guyana, Paraguay, Peru, Venezuela.
Oceania: Australia, New Zealand, Solomon Islands, Wallis & Futuna Islands (France).