Using CCOC(=O)C(Cl)(c1cnc(C(C)(C)C)nc1)C(C)(C)C to produce CCOC(=O)C(c1cnc(C(C)(C)C)nc1)C(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.