Using CCOC(=O)c1sc(N2CCOCC2)nc1Br, Fc1cc(CBr)ccc1Cl to produce CCOC(=O)c1sc(N2CCOCC2)nc1Cc1ccc(Cl)c(F)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.