HNCO, or hydrogen cyanate, is a chemical compound with the formula HNCO. It is a colorless liquid that has a faint odor and is known for its toxicity. HNCO is primarily used in the production of various chemicals and as a reagent in organic synthesis. This compound can be formed through the reaction of cyanamide and formic acid or by the hydrolysis of isocyanic acid. Due to its hazardous nature, HNCO must be handled with care in controlled environments to prevent exposure and potential health risks.