Using CC(C)(C)OC(=O)COc1cc2cc(C(C)(C)O)sc2c(Cl)c1Cl to produce CC(C)(O)c1cc2cc(OCC(=O)O)c(Cl)c(Cl)c2s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.