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Ball-and-stick model of a pyrrole molecule. Black = carbon, blue = nitrogen, white = hydrogen
Pyrrole is a heterocyclic, organic compound the molecules of which contain a ring of four carbon atoms and one nitrogen. Its chemical formula is C4H5N. Pyrrole is colorless liquid that smells like chloroform. Many natural coloring materials are derived from pyrrole, including chlorophyll and hemoglobin.

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