Using CC(=O)O, COC(=O)c1cc(C=Cc2ccc(S(=O)(=O)O)cc2)ccc1O to produce COC(=O)c1cc(C=Cc2ccc(S(=O)(=O)O)cc2)ccc1OC(C)=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.