Using C1COCCO1, O=c1c(-n2ccnn2)c[nH]n1-c1cc(Cl)ncn1 to produce COc1cc(-n2[nH]cc(-n3ccnn3)c2=O)ncn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.