Using CC(=O)Oc1c(CC=C(C)C)c(O)cc(O)c1C(=O)CCc1ccc(O)cc1 to produce CC(C)=CCc1c(O)cc(O)c(C(=O)CCc2ccc(O)cc2)c1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.