Using COC(=O)COCc1ccccc1, COC(=O)C(=O)OC(C)(C)C to produce COC(=O)/C(OCc1ccccc1)=C(\O)C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.