L-Glutamine Diethylamide, CAS 745738-16-3, is an amide impurity derived from the glutamine scaffold in which the terminal carboxamide nitrogen is N,N-diethyl-substituted. With molecular formula C9H19N3O2 and molecular weight 201.27 g/mol, it is a polar, basic analog whose occurrence may reflect incomplete amidation control, alkylamination side reactions, or transformation during process-related stress. As a nonclassical glutamine derivative rather than a nitrosamine, its regulatory evaluation still requires structural elucidation and toxicological assessment under impurity control principles. Trace analysis typically relies on LC-MS/MS, high-resolution LC-MS, and, where volatility permits, GC-MS after derivatization.
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