Using BrCCOCCBr, CCN(C)CCCOc1ccc(C2(CN)CCOCC2)cc1 to produce CCN(C)CCCOc1ccc(C2(CN3CCOCC3)CCOCC2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.