Using Clc1ccc2c(c1)C(c1ccccc1)=Nc1cccnc1N2, CI to produce CN1c2ccc(Cl)cc2C(c2ccccc2)=Nc2cccnc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.