Using ClCc1[nH]c(-c2ccc(Cl)s2)nc1-c1cccnc1, O=C([O-])O to produce COCc1[nH]c(-c2ccc(Cl)s2)nc1-c1cccnc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.