Using C=C(COc1ccc(C(=O)CCC(=O)OC)cc1)COc1ccc(C(C)=O)c(O)c1CCC to produce C=C(COc1ccc(C(=O)CCC(=O)O)cc1)COc1ccc(C(C)=O)c(O)c1CCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.