Using Brc1ccc2c(c1)C(N1CCC3(CC1)OCCO3)c1ccccc1CO2 to produce O=C1CCN(C2c3ccccc3COc3ccc(Br)cc32)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.