Using COC(=O)C(Br)CC(N)=O, CCOC(=O)C(NC(C)=O)C(=O)OCC to produce CCOC(=O)C(NC(C)=O)(C(=O)OCC)C1CC(=O)NC1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.