Using COC(=O)C1=Cc2cc(C(=S)c3ccccc3C)c(O)cc21 to produce Cc1ccccc1C(=S)c1cc2c(cc1O)C(C(=O)O)=C2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.