Using CCOC(=O)COc1ccc(-c2cc(O)c(SCCc3ccccc3)c(=O)o2)cc1 to produce O=C(O)COc1ccc(-c2cc(O)c(SCCc3ccccc3)c(=O)o2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.