Using O=C1OC(Cn2c3ccc(Br)cc3c3cc(Br)ccc32)CN1c1ccccn1 to produce OC(CNc1ccccn1)Cn1c2ccc(Br)cc2c2cc(Br)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.