Using O=C1CCC(=O)N1Br, Cc1cscc1Nc1nc2ccc(F)cc2[nH]1 to produce Cc1csc(Br)c1Nc1nc2cc(F)ccc2[nH]1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.