Using CCOC(=O)c1c(-c2cc(Cl)c(OCc3ccccc3)c(Cl)c2)csc1NC(=O)CC(=O)OC to produce O=c1cc(O)c2c(-c3cc(Cl)c(OCc4ccccc4)c(Cl)c3)csc2[nH]1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.