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Purine has the formula C5H4N4. It is a heterocyclic aromatic compound that is the namesake for...

Purine has the formula C5H4N4. It is a heterocyclic aromatic compound that is the namesake for the so-called purines adenine and guanine in DNA and RNA. Try to draw purine from memory. If you get stuck, go ahead and check the appendix of your textbook or your Ch. 3 notes. Then, get a fresh piece of blank paper and try to draw it again, and then again and again until you know it. It should become part of your organic chemistry vocabulary, like the way the 12 x 12 times table is part of your math vocabulary. Now that you know how to draw purine, you can answer the following question: what are the number and types of lone pairs of electrons that purine has?

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