Using O=C1CCC(=O)N1Br, COC(=O)c1nc2n(c(=O)c1OC(=O)c1ccccc1)CCCC2 to produce COC(=O)c1nc2n(c(=O)c1OC(=O)c1ccccc1)CCCC2Br, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.