(-)-AL03152 145555-03-9 AL 3803 Spiro(9H-fluorene-9,4'-imidazolidine)-2',5'-dione, 2,7-difluoro-4-methoxy-, (4'S)- Spiro(9H-fluorene-9,4'-imidazolidine)-2',5'-dione, 2,7-difluoro-4-methoxy-, (S)-