*** CHEMICAL IDENTIFICATION ***

RTECS NUMBER            : GU5330000
CHEMICAL NAME           : 2,5-Cyclohexadiene-1,4-dione,
                          2-methyl-5-(1-methylethyl)-
CAS REGISTRY NUMBER     : 490-91-5
BEILSTEIN REFERENCE NO. : 1939047
REFERENCE               : 4-07-00-02100 (Beilstein Handbook Reference)
LAST UPDATED            : 199701
DATA ITEMS CITED        : 3
MOLECULAR FORMULA       : C10-H12-O2
MOLECULAR WEIGHT        : 164.22
WISWESSER LINE NOTATION : L6V DVJ B1 EY1&1
COMPOUND DESCRIPTOR     : Mutagen
SYNONYMS/TRADE NAMES :
   * 2,5-Cyclohexadiene-1,4-dione, 5-isopropyl-2-methyl-
   * p-Mentha-3,6-diene-2,5-dione
   * Thymoquinon
   * Thymoquinone
 
                       *** HEALTH HAZARD DATA ***
 
                        ** ACUTE TOXICITY DATA **
 
TYPE OF TEST            : LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE       : Intraperitoneal
SPECIES OBSERVED        : Rodent - rat
DOSE/DURATION           : 10 mg/kg
TOXIC EFFECTS :
   Details of toxic effects not reported other than lethal dose value
REFERENCE :
   ARZNAD Arzneimittel-Forschung. Drug Research.  (Editio Cantor Verlag,
   Postfach 1255, W-7960 Aulendorf, Fed. Rep. Ger.)  V.1-    1951-
   Volume(issue)/page/year: 15,1227,1965
 
                            ** MUTATION DATA **
 
TYPE OF TEST            : Mutation in microorganisms
TEST SYSTEM             : Bacteria - Salmonella typhimurium
DOSE/DURATION           : 20 nmol/plate
REFERENCE :
   MUREAV Mutation Research.  (Elsevier Science Pub. B.V., POB 211, 1000 AE
   Amsterdam, Netherlands) V.1-    1964-  Volume(issue)/page/year: 347,37,1995

                          *** STATUS IN U.S. ***
 
   EPA TSCA Section 8(b) CHEMICAL INVENTORY

 
                            *** END OF RECORD ***