Summary:
Which Molecule is Not a Heterocyclic Compound?
The Heterocyclic compounds are widely distributed in nature and are very essential to life; they play an important role in all living cells’ metabolism. For instance, these are heterocyclic: the purine and pyrimidine bases of DNA and RNA; these are the three essential amino acids (proline, tryptophan, and histidine); there are several vitamins and coenzyme precursors (riboflavin, thiamine, pyridoxine, biotin, folic acid, and the B12 and E families of vitamins); the oxygen-transporting pigment hemoglobin and its breakdown products, the photosynthesizing pigment chlorophyll; many hormones; the bile pigments; (kinetin, serotonin, heteroauxin, and histamine); and most sugars.
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