3K4V:
reference: Carbamylation of N-terminal proline., Olajuyigbe FM, Demitri N, Ajele JO, Maurizio E, Randaccio L, Geremia S, ACS Med Chem Lett. 2010 Jun 2;1(6):254-7. doi: 10.1021/ml100046d. eCollection, 2010 Sep 9. PMID: 24900204

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).