3d image of purine skeletal formula

3d isolated white background chemistry chemical biochemistry science scientific organic molecule molecular structural structure formula skeletal isomer orbital substance matter material agent metabolite metabolism biosynthesis aromatic heterocyclic heterocycle ring purine synthesis base rich food nucleotide function catabolism degradation c5h4n4 dna biology nitrogenous pyrimidine imidazole tautomer nucleobases rna complementary