Using BrCc1ccccc1, O=C1OCCC1N=C(c1ccccc1)c1ccccc1 to produce O=C1OCCC1(Cc1ccccc1)N=C(c1ccccc1)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.