[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a yellow-green gas that is heavier than air and has a strong irritating odor. It can be converted to a liquid under pressure or cold temperatures. Chlorine is mainly used as bleach in the manufacture of paper and cloth and to make a wide variety of products."}, {"from": "gpt", "value": "[Cl][Cl]"}]