113694-81-8 4-((3-Pyridinylcarbonyl)amino)butanoic acid hydrobromide BUTANOIC ACID, 4-((3-PYRIDINYLCARBONYL)AMINO)-, MONOHYDROBROMIDE Butyric acid, 4-nicotinamido-, monohydrobromide N-Nicotinoyl-gamma-aminobutyric acid hydrobromide