Using COC(=O)c1cc(OCc2cc(SC)cc(SC)c2)cc(OCc2cc(SC)cc(SC)c2)c1 to produce CSc1cc(COc2cc(CO)cc(OCc3cc(SC)cc(SC)c3)c2)cc(SC)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.