SMILES: C1C[C@H](NC1)C(=O)N2C[C@@H](C[C@H]2C(=O)O)O
Description: The molecule is a dipeptide composed of L-proline and L-hydroxyproline residues. It is a biomarker for bone collagen degradation. It has a role as a diagnostic agent, a human metabolite and a biomarker. It derives from a L-proline and a trans-4-hydroxy-L-proline. It is a tautomer of a Pro-Hyp zwitterion.