Using CCOC(=O)C1=C(COCCN)NC(C)=C(C(=O)OC)C1c1cccc(Cl)c1Cl, COC(=O)CBr to produce CCOC(=O)C1=C(COCCNCC(=O)OC)NC(C)=C(C(=O)OC)C1c1cccc(Cl)c1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.