Using CC(=O)O, COc1cc(OC)nc(OC(C(=O)O)C(SC)(c2ccccc2)c2ccccc2)n1 to produce COc1cc(OC)nc(OC(C(=O)O)C(c2ccccc2)(c2ccccc2)S(C)=O)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.