Using O=C(O)c1ccc2c(c1[Se]Cc1ccccc1)OCO2, Nc1ccccc1 to produce O=C(Nc1ccccc1)c1ccc2c(c1[Se]Cc1ccccc1)OCO2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.