Using CC(=O)O[C@@H]1C[C@@H](C)c2c1ncnc2N1CCN(C(=O)OC(C)(C)C)C[C@@H]1C to produce C[C@@H]1C[C@@H](O)c2ncnc(N3CCN(C(=O)OC(C)(C)C)C[C@@H]3C)c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.