Using O=S(=O)(c1ccccc1)n1cc(C(O)c2ccc(CNc3ccc(Cl)cc3)nc2)c2cccnc21, CO to produce COC(c1ccc(CNc2ccc(Cl)cc2)nc1)c1c[nH]c2ncccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.