[{"from": "human", "value": "Generate a molecule based on this description. The molecule is a 1,2-diacyl-sn-glycero-3-phosphoethanolamine zwitterion in which the acyl group at position 1 is specified as stearoyl (octadecanoyl) while that at position 2 is unspecified."}, {"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][C@H1][Branch1][=C][C][O][P][=Branch1][C][=O][Branch1][C][O-1][O][C][C][NH3+1][O][C][=O]"}]