Using O=C(O)c1cc2c(Br)cccc2[nH]1, NC1CCN(CCN2CCCCCC2)CC1 to produce O=C(NC1CCN(CCN2CCCCCC2)CC1)c1cc2c(Br)cccc2[nH]1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.