Title: Cyclobarbital
CAS Registry Number: 52-31-3
CAS Name: 5-(1-Cyclohexen-1-yl)-5-ethyl-2,4,6(1H,3H,5H)-pyrimidinetrione
Additional Names: 5-(1-cyclohexen-1-yl)-5-ethylbarbituric acid; cyclobarbitone; hexemal; tetrahydrophenobarbital
Trademarks: Cavonyl; Cyclodorm; Cyklodorm; Fanodormo; Irifan; Namuron; Palinum; Phanodorm (Winthrop); Phanodorn (Winthrop); Philodorm; Prälumin; Pro-Sonil; Sonaform
Molecular Formula: C12H16N2O3
Molecular Weight: 236.27
Percent Composition: C 61.00%, H 6.83%, N 11.86%, O 20.31%
Literature References: Prepn: GB 231150 (1924 to Bayer); Schulemann, Meisenburg, US 1690796 (1929 to Winthrop); Eckstein, Przem. Chem. 9, 390 (1953), C.A. 49, 11668c (1955). Toxicity data: G. Hofrichter et al., Arzneim.-Forsch. 17, 242 (1967).
Properties: Shiny crystals, insipid bitter taste, mp 171-174°. Very slightly sol in cold water, appreciably sol in boiling water. One gram dissolves in 5 ml alcohol, 20 ml ether. LD50 in mice, rats (mg/kg): 350, 290 i.p. (Hofrichter).
Melting point: mp 171-174°
Toxicity data: LD50 in mice, rats (mg/kg): 350, 290 i.p. (Hofrichter)
Derivative Type: Calcium salt
CAS Registry Number: 143-76-0
Additional Names: Hexemal calcium
Trademarks: Itridal; Kollerdormfix; Pronox (Reiss)
Molecular Formula: C24H30CaN4O6
Molecular Weight: 510.60
Percent Composition: C 56.45%, H 5.92%, Ca 7.85%, N 10.97%, O 18.80%
Properties: Minute crystals. Appreciably bitter taste. Slightly basic reaction. Soly in water about 1 part in 70 parts (w/w), in 95% alc about 1 part in 500 parts. Practically insol in ether, chloroform.
NOTE: This is a controlled substance (depressant): 21 CFR, 1308.13.
Therap-Cat: Sedative, hypnotic.
Therap-Cat-Vet: Has been used as an anesthetic and sedative.
Keywords: Sedative/Hypnotic; Barbituric Acid Derivatives.

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