3-Chlorophenyl isocyanate (3CIP) is a chemical compound with the chemical formula C6H4ClNO2. It is synthesized by reacting chloroform and phenyl isocyanate, which are both colorless gases at room temperature. 3CIP has low energy and a helical structure that allows it to form hydrogen bonds with other molecules. 3CIP can be used as an herbicide or pesticide, but its use may have ecological effects.