Using CC(=O)N1CC(C)(C)c2ccc(N3C(=O)N(Cc4ccnc(Cl)c4)C(C)(C)C3=O)cc21 to produce CC1(C)CNc2cc(N3C(=O)N(Cc4ccnc(Cl)c4)C(C)(C)C3=O)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.