Using O=C1NC2C=CC1C2, CC(C)(C)OC(=O)OC(C)(C)C to produce CC(C)(C)OC(=O)N1C(=O)[C@H]2C=C[C@@H]1C2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.