Using CN1Cc2ccccc2[C@H]2c3cccc4[nH]cc(c34)C[C@@H]21, CI to produce CN1Cc2ccccc2[C@H]2c3cccc4c3c(cn4C)C[C@@H]21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.