Using COc1ccc(CN2C(=O)c3cccc(Cl)c3C23C=CN(C(=O)OC(C)(C)C)CC3)cc1 to produce COc1ccc(CN2C(=O)c3cccc(Cl)c3C23CCN(C(=O)OC(C)(C)C)CC3)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.