Title: 2-Amino-3-carb-oxy-pyridinium nitrate.
Journal: Acta crystallographica. Section E, Structure reports online 20110801
Title: Chemoselective cyclization of aminonicotinic acid derivatives to 1,8-naphthyridin-2-ones via a potential intramolecular azadiene-ketene electrocyclization reaction.
Journal: The Journal of organic chemistry 20010615