Using CC(C)(C)OC(=O)N1CCC(Oc2cc(C(C)(C)C)ccc2CN2C(=O)c3ccccc3C2=O)CC1 to produce CC(C)(C)OC(=O)N1CCC(Oc2cc(C(C)(C)C)ccc2CN)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.