CAS 89391-50-4 appears in our catalog under these names: Imirestat (AL 1576), Imirestat/ 99.08% (existing batch purity), Imirestat 99%, 2,7-difluorospiro[fluorene-9,4'-imidazolidine]-2',5'-dione, 99%, 99%, Imirestat, 99.59%. Offered by: GLPBio, TargetMol, Ambeed, Chemat, MedChemExpress. Available pack sizes: 50mg, 1mg, 5mg, 10mg, 25mg, 100mg, 200mg, 10mM (in 1ml dmso).