Using CCCC[C@H](C)C[C@@H](/C=C/[C@H]1CC[C@H](OC(C)=O)[C@@H]1CCCCCC([Se]c1ccccc1)C(=O)OC)OC1CCCCO1 to produce CCCC[C@H](C)C[C@@H](/C=C/[C@H]1CC[C@H](O)[C@@H]1CCCCCC([Se]c1ccccc1)C(=O)OC)OC1CCCCO1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.