[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a ceramide phosphoethanolamine (33:1) in which the sphingoid and acyl components are pentadecasphing-4-enine and octadecanoyl respectively. It is functionally related to an octadecanoic acid."}, {"from": "gpt", "value": "[C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][=Branch1][C][=O][N][C@@H1][Branch1][=C][C][O][P][=Branch1][C][=O][Branch1][C][O][O][C][C][N][C@@H1][Branch1][=N][/C][=C][/C][C][C][C][C][C][C][C][C][C][O]"}]