Using O=C(OCc1ccccc1)c1cc(CN2CCOCC2)c(Br)cc1OCc1ccccc1 to produce O=C(O)c1cc(CN2CCOCC2)c(Br)cc1OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.