Using Cc1nnc2c(NC(=O)OC(C)(C)C)cc(Cl)nn12, CI to produce Cc1nnc2c(N(C)C(=O)OC(C)(C)C)cc(Cl)nn12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.