Using COC(=O)C(C)(SC)c1cccc(C2(c3ccccc3)OCCO2)c1 to produce CSC(C)(C(=O)O)c1cccc(C2(c3ccccc3)OCCO2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.