Carbamic acid is the compound with the formula NH
2COOH. The attachment of the acid group to a nitrogen or
amine (instead of carbon) distinguishes it from
carboxylic acid and an
amide. Many derivatives and analogues of carbamic acid are known. They are generally unstable, reverting to the parent amine and
carbon dioxide. The deprotonated anion (or conjugate base) of this functional group is a
carbamate. Carbamic acid is a planar molecule.