Using Cc1nc(Nc2cnccn2)sc1-c1cccc(S(=O)(=O)Cl)c1, NCCO to produce Cc1nc(Nc2cnccn2)sc1-c1cccc(S(=O)(=O)NCCO)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.