1,2,4-Triazolo(4,3-a)pyridine-2(3H)-propanoic acid, 3-oxo- 3-Oxo-1,2,4-triazolo(4,3-a)pyridine-2(3H)-propanoic acid 53304-46-4 BRN 0614874 beta-(3-Oxo-s-triazolo)-(4,3a)-pyridin-2-yl-propionic acid