4425-97-2 9,9'-Fluorenedipropionitrile 9H-Fluorene-9,9-dipropanenitrile Fluorene-9,9-bis(propionitrile) Fluorene-9,9-dipropionitrile NSC30667 Propionitrile, 3,3'-fluoren-9-ylidenedi- WLN: L B656 HHJ H2CN H2CN