3d image of cytosine skeletal formula

cytosine c4h5n3o base dna rna pyrimidine derivative nucleotide guanine deamination methylation bond thymine uracil adenine nitrogenous deoxyribose purine synthesis pairing imino geometry hybridization biology cytidine keto role protein actg 3d rendering chemistry chemical biochemistry molecule molecular structural structure formula skeletal isomer metabolite metabolism biosynthesis mechanism heterocyclic heterocycle ring nitrogen