[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a 1-acyl-2-octadecanoyl-sn-glycero-3-phosphate(2-) in which the 1-acyl group is specified as hexadecanoyl (palmitoyl); major species at pH 7.3. It is a conjugate base of a 1-hexadecanoyl-2-octadecanoyl-sn-glycero-3-phosphate."}, {"from": "gpt", "value": "[C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][=Branch1][C][=O][O][C@H1][Branch2][Ring1][=Branch1][C][O][C][=Branch1][C][=O][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][O][P][=Branch1][C][=O][Branch1][C][O-1][O-1]"}]