[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is an amino acid derivative comprised of three allysyl side chains plus one unaltered lysyl side chain from the same or neighboring polypeptides condensed into a pyridinium ring. Desmosine is found in elastin and its detection in urine, plasma, or sputum samples can be used as a marker for excessive elastin degradation, which is associated with chronic obstructive pulmonary disease (COPD) and other pathologies."}, {"from": "gpt", "value": "[C][=C][Branch2][Ring2][P][C][=Branch2][Ring1][P][=C][Branch2][Ring1][C][C][=N+1][Ring1][=Branch1][C][C][C][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O][N][C][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O][N][C][C][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O][N][C][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O][N]"}]