[{"from": "human", "value": "Use the given information to create a molecule that fulfills the desired purpose. The molecule appears as a colorless liquid with a faint odor of ammonia. Denser than water. Freezing point 36 \u00b0F. (USCG, 1999)"}, {"from": "gpt", "value": "[C][=Branch1][C][=O][N]"}]