Using Cc1cccc(Nc2cc(Cl)nc(SCC(=O)O)n2)c1C, NCCO to produce Cc1cccc(Nc2cc(Cl)nc(SCC(=O)NCCO)n2)c1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.