3-(5-Methyl-7-oxo-4,7-dihydro-[1,2,4]triazolo-[1,5-a]pyrimidin-6-yl)-propionic acid3-(5-Methyl-7-oxo-4,7-dihydro[1,2,4]triazolo[1,5-a]pyrimidin-6-yl)propanoic acid3-(5-methyl-7-oxo-4,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidin-6-yl)propanoic acid3-{5-methyl-7-oxo-4H,7H-[1,2,4]triazolo[1,5-a]pyrimidin-6-yl}propanoic acid