1-Benzoyl-2-thiohydantoin 4-Imidazolidinone, 1-benzoyl-2-thioxo- (9CI) 5-24-05-00243 (Beilstein Handbook Reference) 577-47-9 BRN 0182345 HYDANTOIN, 1-BENZOYL-2-THIO- NSC 8067 USAF B-14 USAF EK-3881