Cyanic acid is a chemical compound with the formula HOCN. It is a colorless, toxic liquid that can be produced through the hydrolysis of cyanogen chloride or by the reaction of sodium cyanide with sulfuric acid. Cyanic acid is known for its use in organic synthesis and can form various derivatives. In its pure form, cyanic acid is unstable and can decompose into urea and carbon monoxide. Due to its toxicity, it poses health risks if inhaled or ingested. Proper safety measures are essential when handling this compound in laboratory settings.