Using CCOC(=O)CC1(O)CCc2nc(C(C)C)n(Cc3ccc(Cl)cc3)c21 to produce CCOC(=O)C=C1CCc2nc(C(C)C)n(Cc3ccc(Cl)cc3)c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.