ChEBI: 6-hydroxynicotinic acid is a monohydroxypyridine that is the 6-hydroxy derivative of nicotinic acid. It has a role as a mouse metabolite, a human urinary metabolite and an Arabidopsis thaliana metabolite. It is functionally related to a nicotinic acid. It is a conjugate acid of a 6-hydroxynicotinate(1-).