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Cytosin, 4-Amino-2-hydroxypyrimidine. Cytosine is one of the four main bases found in DNA and RNA, along with adenine, guanine, and thymine (uracil in RNA). It is a pyrimidine derivative, with a heterocyclic aromatic ring and two substituents attached (an amine group at position 4 and a keto group at position 2). The nucleoside of cytosine is cytidine. In Watson-Crick base pairing, it forms three hydrogen bonds with guanine.
Assay: min. 97% (HPLC); Melting point: >300°C; pKa1 (20°C): 4.4; pKa2 (20°C): 12.5; heavy metals (as Pb): max. 0.001%; MW=111.10 g/mol; C4H5N3O.
Sicherheits Hinweise / SafetyH-Sätze: H315, H319, H335
Klassifizierungen / ClassificationEC-Nr: 200-749-5
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