Using OB(O)c1ccc(Cl)cc1, O=C(c1nc(Br)cs1)N1CC2CCC(C1)O2 to produce O=C(c1nc(-c2ccc(Cl)cc2)cs1)N1CC2CCC(C1)O2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.