Using COC(=O)[C@H](CC(CF)NC(=O)OCc1ccccc1)[Se]c1ccccc1 to produce COC(=O)/C=C/[C@@H](CF)NC(=O)OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.