[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is a glycerol backbone covalently bound to a phosphate group in one position, and fatty acids in the 2nd and 3rd positions. Phosphatidic acids thus have a polar head and apolar tails, and occur in cell membranes throughout nature."}, {"from": "gpt", "value": "[C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][=Branch1][C][=O][O][C][C@H1][Branch1][O][C][O][P][=Branch1][C][=O][Branch1][C][O][O][O][C][=Branch1][C][=O][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C]"}]