Using O=C1CCC(=O)N1Br, COC(=O)c1cccc(-c2cnc3oc(-c4ccc(F)cc4)c(C)c3c2)c1 to produce COC(=O)c1cccc(-c2cnc3oc(-c4ccc(F)cc4)c(C=O)c3c2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.