Using CC1=C(N2CC(O)C3(CCN(C(=O)OC(C)(C)C)CC3)C2=O)COC1=O to produce CC1=C(N2CC(=O)C3(CCN(C(=O)OC(C)(C)C)CC3)C2=O)COC1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.