A alpha,beta-unsaturated monocarboxylic acid that is nicotinic acid which has been hydrogenated at the 1-2 and 5-6 positions of the pyridine ring. ChEBI: Guvacine is a alpha,beta-unsaturated monocarboxylic acid that is nicotinic acid which has been hydrogenated at the 1-2 and 5-6 positions of the pyridine ring. It has a role as a plant metabolite and a GABA reuptake inhibitor. It is a beta-amino acid, a tetrahydropyridine, an alpha,beta-unsaturated monocarboxylic acid, a pyridine alkaloid and a secondary amino compound.