Using CCCC(CCC)(C(=O)C(C(=O)OCC)C(=O)OCC)c1ccccc1 to produce CCCC1(CCC)C(=O)C(C(=O)OCC)=C(O)c2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.