The cyanate ion is an anion with the chemical formula OCN⁻. It is a resonance of three forms: [O⁻−C≡N] ↔ [O=C=N⁻] ↔ [O⁺≡C−N²⁻]. Cyanate is the derived anion of isocyanic acid, H−N=C=O, and its lesser tautomer cyanic acid, H−O−C≡N. Any salt... Wikipedia