Using CCCOc1cc2c(cc1[Se]c1ccc(C(=O)OCC)cn1)C(C)(C)CCC2(C)C to produce CCCOc1cc2c(cc1[Se]c1ccc(C(=O)O)cn1)C(C)(C)CCC2(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.