2,3-HEXANEDIONE 3848-24-6 4-01-00-03687 (Beilstein Handbook Reference) AI3-35989 Acetyl butyryl Acetylbutyryl BRN 1699896 Butyryl acetyl EINECS 223-350-8 FEMA No. 2558 Methyl propyl diketone NSC 31665