1-Acetyl-2-thiohydantoin 4-Imidazolidinone, 1-acetyl-2-thioxo- 5-24-05-00242 (Beilstein Handbook Reference) 584-26-9 BRN 0127294 EINECS 209-535-6 HYDANTOIN, 1-ACETYL-2-THIO- NSC 1920 USAF B-7 USAF BE-0405