Using CCOC(=O)[C@@H]1CCC(=O)N1C(=O)OC(C)(C)C, C[Si](C)(C)C=[N+]=[N-] to produce CCOC(=O)[C@H](CCC(=O)C=[N+]=[N-])NC(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.