Proline is an organic acid classed as a proteinogenic amino acid, although it does not contain the amino group -NH ₂ but is rather a secondary amine. The secondary amine nitrogen is in the protonated form under biological conditions, while the carboxyl group is in the deprotonated −COO⁻ form. Formula: C₅H₉NO₂. Molar mass: 115.13 g/mol.
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