Using CCn1c(=O)n(-c2ccc3c(c2)CCN3c2nc3ccccc3[nH]2)c2ncccc21 to produce CCn1c(=O)n(-c2ccc3c(ccn3-c3nc4ccccc4[nH]3)c2)c2ncccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.