Using CC(C)(C)OC(=O)Cn1c(=O)n(-c2ccccn2)c2ccccc21 to produce O=C(O)Cn1c(=O)n(-c2ccccn2)c2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.