Using C[C@@H]1OC(=O)[C@@H](NC(=O)OC(C)(C)C)CCC[C@H](CC[Se]c2ccccc2[N+](=O)[O-])[C@H]1Oc1ccccc1 to produce C=C[C@H]1CCC[C@H](NC(=O)OC(C)(C)C)C(=O)O[C@@H](C)[C@@H]1Oc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.