![](https://nthumb.tpgimages.com/mid2_com_img/1339/26993/TOP25657576.jpg)
Purine is an aromatic heterocycle, shown here as a ball-and-stick molecular model. The DNA/RNA nucleobases adenine and guanine are purine derivatives. Atoms are colour-coded: carbon is black, hydrogen is white, nitrogen is blue)
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