Using ClCc1c(Cl)cccc1Cl, N[C@@H](Cc1c[nH]cn1)C(=O)O to produce N[C@@H](Cc1cn(Cc2c(Cl)cccc2Cl)cn1)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.