Using COCc1cc(Br)cs1, CON(C)C(=O)C1CCN(C(=O)OC(C)(C)C)CC1 to produce COCc1cc(Br)c(C(=O)C2CCN(C(=O)OC(C)(C)C)CC2)s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.