CAS 99-66-1 appears in our catalog under these names: 2-Propylpentanoic acid, 99%, Valproic Acid, Valproic Acid, >95% (GC), Valproic Acid 1.0 mg/ml in Methanol, Valproic acid, 1mg/ml in Methanol. Offered by: Thermo Scientific (Acros), Chemat Brand, TRC, Mikromol, Lipomed. Available pack sizes: 25g, 100g, on request, 100mg, 10g, 1g, 500mg, 50mg.