Using CC(C)(C)OC(=O)N1CCC(NC(=O)OCc2ccccc2)(C(N)=O)CC1 to produce CC(C)(C)OC(=O)N1CCC(N)(C(N)=O)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.