[{"from": "human", "value": "Provide a description of this molecule. [C][=O]"}, {"from": "gpt", "value": "Solids containing varying amounts of formaldehyde, probably as paraformaldehyde (polymers of formula HO(CH2O)xH where x averages about 30). A hazard to the environment. Immediate steps should be taken to limit spread to the environment."}]