Using C[C@H]1CN(C(=O)c2nn(C)c3ccccc23)C[C@H]1NC(=O)OC(C)(C)C to produce C[C@H]1CN(C(=O)c2nn(C)c3ccccc23)C[C@H]1N, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.