Using O=C(O)Cc1ccc(Nc2cc(C3CC3)nc(-c3cccc(Cl)c3)n2)nc1, NCCO to produce O=C(Cc1ccc(Nc2cc(C3CC3)nc(-c3cccc(Cl)c3)n2)nc1)NCCO, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.