Using CCOC(=O)C[C@@](NC(=O)OC(C)(C)C)(C(=O)O)C(=O)OCC, N to produce CCOC(=O)C[C@@](NC(=O)OC(C)(C)C)(C(N)=O)C(=O)OCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.