Isonicotinic acid

Isonicotinic acid is an organic compound with a carboxyl group on a pyridine ring. It is an isomer of nicotinic acid &mdash; the carboxyl group for isonicotinic acid is on the 4-position instead of the 3-position for nicotinic acid.

Derivatives
Isonicotinic acids is a term loosely used for derivatives of isonicotinic acid. Examples include:
 * ethionamide
 * iproniazid
 * isoniazid
 * nialamide