1,1'-Biphenyl, 4'-ethynyl-2-fluoro- 4'-Ethynyl-2-fluoro-1,1'-biphenyl 4'-Ethynyl-2-fluorobiphenyl 56917-29-4 FLURETOFEN Fluretofen [USAN:INN] Fluretofene [INN-French] Fluretofeno [INN-Spanish] Fluretofenum [INN-Latin] LY 93819