[{"from": "human", "value": "Provide a brief overview of this molecule. [C][C][Branch1][C][C][N][Branch1][=Branch2][C][=C][C][=C][C][=C][Ring1][=Branch1][C][=Branch1][C][=O][C][Cl]"}, {"from": "gpt", "value": "The molecule is widely used as a selective herbicide worldwide in corn, soybean and other crop cultures. Elevated concentrations of these herbicides and their degradation products have been detected in surface and groundwater. Propachlor is a pre-emergence herbicide, effective against annual grasses and certain broad-leaved weeds. It is a compound of the family of chloroacetanilides. (A252, L904)"}]