Using S, Cc1nn(-c2ccccc2)c(Cl)c1C(=O)NCCc1ccccn1 to produce Cc1nn(-c2ccccc2)c(S)c1C(=O)NCCc1ccccn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.