2-(carboxymethylamino)-2-oxoacetic acid 2-(carboxymethylamino)-2-oxo-acetic acid 2-(carboxymethylamino)-2-keto-acetic acid 2-(carboxymethylamino)-2-oxo-ethanoic acid 5262-39-5 Glycine, N-(carboxycarbonyl)- Oxaloglycine Oxalylglycine OGA N-OXALYOLGLYCINE