Using COc1cc(CCl)ncc1C, Sc1nc2cc3c(cc2[nH]1)OCO3 to produce COc1cc(CSc2nc3cc4c(cc3[nH]2)OCO4)ncc1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.