Using CCc1c(S(C)=O)n(CCCCOC(C)=O)c(=S)[nH]c1=O, [SeH]c1ccccc1 to produce CCc1c([Se]c2ccccc2)n(CCCCO)c(=S)[nH]c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.