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Cytosine

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Cytosine molecular structure
Molecular structure

The Sigma-Aldrich catalog lists 8 grades and pack sizes of Cytosine (CAS 71-30-7). Pick the code you need and request a quote for price and lead time from Klar Chem.

CAS71-30-7
Molecular formulaC4H5N3O
Molecular weight111.1 g/mol
IUPAC name6-amino-1H-pyrimidin-2-one
Synonyms4-Amino-2-hydroxypyrimidine · 4-aminopyrimidin-2(1H)-one · Cytosinimine · 2(1H)-Pyrimidinone, 4-amino- · 4-Amino-2(1H)-pyrimidinone · 6-amino-1H-pyrimidin-2-one
Safety & Hazards (GHS) Warning
Irritant Irritant
  • H315 Causes skin irritation
  • H319 Causes serious eye irritation
  • H335 May cause respiratory irritation

⚠️ For information only (source: EU CLP harmonised classification and ECHA notifications, via PubChem); not a substitute for the official Safety Data Sheet (SDS).

Catalog codes and grades

Brand Product / grade Code
Sigma CYTOSINE C3506-100G
C3506-10G
C3506-1G
C3506-25G
C3506-5G
PHR1350-500MG		 Request Quote
Sigma CYTOSINE, UNITED STATES PHARMACOPEIA (US 1162148-100MG Request Quote
Sigma GEMCITABINE IMPURITY A Y0000676 Request Quote

For information only; specifications and availability are confirmed at quotation. Prices are not listed.