[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a sphingomyelin d18:1 in which the ceramide N-acyl group is specified as dodecanoyl (lauroyl). It is a sphingomyelin 30:1 and a sphingomyelin d18:1."}, {"from": "gpt", "value": "[C][C][C][C][C][C][C][C][C][C][C][C][C][/C][=C][/C@H1][Branch2][Ring2][=Branch2][C@H1][Branch2][Ring1][Branch1][C][O][P][=Branch1][C][=O][Branch1][C][O-1][O][C][C][N+1][Branch1][C][C][Branch1][C][C][C][N][C][=Branch1][C][=O][C][C][C][C][C][C][C][C][C][C][C][O]"}]