Using NCC(=O)c1cccc(Br)c1, CCOC(CBr)(OCC)C(=O)O to produce CCOC(CBr)(OCC)C(=O)NCC(=O)c1cccc(Br)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.