The isocyanic acid tautomer,
HN=C=O,
of cyanic acid,
HOC≡N
and its
hydrocarbyl derivatives
RN=C=O.
Source:
PAC, 1995, 67, 1307
(Glossary of class names of organic compounds and reactivity intermediates based on
structure (IUPAC Recommendations 1995))
on page 1344