Using C[C@@H](Nc1c(C(N)=O)cnn2cc(-c3cccc(C(=O)O)c3)cc12)C1CC1, CNC to produce C[C@@H](Nc1c(C(N)=O)cnn2cc(-c3cccc(C(=O)N(C)C)c3)cc12)C1CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.