Using CC(C)(C)OC(=O)NC(=O)OC(C)(C)C, ClCc1ccncc1Br to produce CC(C)(C)OC(=O)N(Cc1ccncc1Br)C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.