title: [Spectrophotometric method of analysis of pyridine derivatives and pyridinecarbonic acids].
mesh_terms: D009536:Niacinamide / Q000032:analysis*; D009539:Nicotinic Acids / Q000032:analysis*; D011736:Pyridoxine / Q000032:analysis*; D013053:Spectrophotometry
chemical_list: D009539:Nicotinic Acids; D009536:Niacinamide; D011736:Pyridoxine
vernacular_title: Spektrofotometrychnyĭ metod analizu pokhidnykh pirydynu ta pirydynkarbonovykh kyslot.