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CAS 71-30-7

CAS 71-30-7 matches 0 EU annex records across Annex II–VI of Regulation 1223/2009.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 71-30-7
CAS 71-30-7PubChem CID 597

Cytosine

Cytosine is an aminopyrimidine that is pyrimidin-2-one having the amino group located at position 4. It has a role as a mouse metabolite, a Saccharomyces cerevisiae metabolite, an Escherichia coli metabolite and a human metabolite. It is a pyrimidine nucleobase, a pyrimidone and an aminopyrimidine. — ChEBI

IUPAC name
6-amino-1H-pyrimidin-2-one
Molecular formula
C4H5N3O
Molecular weight
111.10 g/mol
Exact mass
111.043261792 Da
XLogP3
-1.7
Topological polar surface area
67.5 Ų
Hydrogen-bond donors
2
Hydrogen-bond acceptors
2
Covalent units
1
Defined stereocentres
0

Also known as

4-aminopyrimidin-2(1H)-one4-Amino-2-hydroxypyrimidineCytosinimine2(1H)-Pyrimidinone, 4-amino-4-Amino-2(1H)-pyrimidinoneNSC-277878J337D1HZYCHEBI:16040
16 more reported names
4-amino-3h-pyrimidin-2-one6-amino-1,2-dihydropyrimidin-2-oneRefChem:5728200-749-54-Aminouracil6-Aminopyrimidin-2(1h)-One4-aminopyrimidin-2-olCytosin4-amino-2-pyrimidinol2(1H)-pyrimidinone, 6-amino-4-amino-2-oxo-1,2-dihydropyrimidineZytosinCytAI3-522816-amino-3-hydropyrimidin-2-onepyrimidine, 4-amino-2-hydroxy-
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External database identifiers

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Records for CAS 71-30-7

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How CAS 71-30-7 is used on this site

CAS 71-30-7 is the Chemical Abstracts Service identifier used to pin this page to a specific substance. In the current dataset, 0 EU annex records share this identifier, which helps you cross-check whether the same substance appears under one regulatory context or several.

Use this page when a supplier specification, SDS or raw-material dossier gives you CAS 71-30-7 and you need to see every linked Annex II–VI record in one place. The entry cards above are the quickest route to concentration limits, warnings, annex placement and product-type conditions.