[{"from": "human", "value": "Generate a molecule based on this description. The molecule is an ammonium ion resulting from the protonation of the nitrogen of ethylamine. The conjugate acid of ethylamine; major species at pH 7.3. It is an ammonium ion derivative and an organic cation. It is a conjugate acid of an ethylamine."}, {"from": "gpt", "value": "[C][C][NH3+1]"}]