[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a colourless liquid which acquires a yellow colour upon storage in air. It is one of the four isomeric amines of butane. It is known to have the fishy, ammonia-like odor common to amines."}, {"from": "gpt", "value": "[C][C][C][C][N]"}]