139911-05-0 2,7-Difluoro-4,5-dimethoxyspiro-(9H-fluorene-9,4'-imidazoline)-2',5'-dione AL 4114 AL-4114 Alo 4114 Spiro(9H-fluorene-9,14'-imidazolidine)-2',5'-dione, 2,7-difluoro-4,5-dimethoxy-