C6H7N3O2

C6H7N3O2 is the molecular formula for several chemical compounds, with the most common isomer being cytosine. Cytosine is a nucleobase, one of the fundamental building blocks of nucleic acids such as DNA and RNA. In DNA, cytosine pairs with guanine. Its structure consists of a pyrimidine ring with amino and keto groups.

Another isomer with the formula C6H7N3O2 is isocytosine, also known as 2-aminopyrimidin-4-one. Isocytosine is a structural isomer of cytosine and exhibits different base-pairing properties. While cytosine is one of the standard bases in genetic material, isocytosine is less common and can be found in some modified nucleotides or as a research chemical.

The differing arrangement of atoms within the C6H7N3O2 formula leads to these distinct compounds with unique chemical and biological roles. The study of these isomers is important in understanding molecular biology, genetics, and medicinal chemistry. The formula itself represents the elemental composition and the number of atoms of carbon, hydrogen, nitrogen, and oxygen present in one molecule of these substances.