Using NCC1Cc2cc(Br)cc3[nH]c(=O)c(=O)n1c23, O=C(O)c1ccccc1 to produce O=C(NCC1Cc2cc(Br)cc3[nH]c(=O)c(=O)n1c23)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.