Using Cn1c(=O)n(CC(C)(C)C)c2ccc(C3CN(C(=O)OC(C)(C)C)CCC3O)nc21 to produce Cn1c(=O)n(CC(C)(C)C)c2ccc(C3CN(C(=O)OC(C)(C)C)CCC3=O)nc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.