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  • 7-Chloro-5-(2-fluorophenyl)-1,3-dihydro-1,4-benzodiazepin-2-one
CAS Number
PubChem CID
CompTox Dashboard (EPA)
ECHA InfoCard100.018.863 Edit this at Wikidata
Chemical and physical data
Molar mass288.71 g·mol−1
3D model (JSmol)
Melting point205 to 206 °C (401 to 403 °F) [1]
  • Fc1ccccc1C2=NCC(=O)Nc3ccc(Cl)cc23

N-Desalkylflurazepam (also known as norflurazepam) is a benzodiazepine analog and an active metabolite of several other benzodiazepine drugs including flurazepam,[2] flutoprazepam,[3] fludiazepam,[4] midazolam,[5] flutazolam,[6] quazepam,[7] and ethyl loflazepate.[8][9] It is long-acting, prone to accumulation, and binds unselectively to the various benzodiazepine receptor subtypes.[7] It has been sold as a designer drug from 2016 onward.[10]


  1. ^ SciFinder record for CAS#2886-65-9
  2. ^ Riva R, de Anna M, Albani F, Baruzzi A (March 1981). "Rapid quantitation of flurazepam and its major metabolite, N-desalkylflurazepam, in human plasma by gas-liquid chromatography with electron-capture detection". Journal of Chromatography. 222 (3): 491–5. doi:10.1016/S0378-4347(00)84153-5. PMID 7228960.
  3. ^ Barzaghi N, Leone L, Monteleone M, Tomasini G, Perucca E (1989). "Pharmacokinetics of flutoprazepam, a novel benzodiazepine drug, in normal subjects". European Journal of Drug Metabolism and Pharmacokinetics. 14 (4): 293–8. doi:10.1007/bf03190114. PMID 2633923. S2CID 20710732.
  4. ^ Descotes J, ed. (December 1996). Human Toxicology (1st ed.). Elsevier Science. p. 43.
  5. ^ Vogt S, Kempf J, Buttler J, Auwärter V, Weinmann W (2013). "Desalkylflurazepam found in patients' samples after high-dose midazolam treatment". Drug Testing and Analysis. 5 (9–10): 745–7. doi:10.1002/dta.1484. PMID 23713025.
  6. ^ Miyaguchi H, Kuwayama K, Tsujikawa K, Kanamori T, Iwata YT, Inoue H, Kishi T (February 2006). "A method for screening for various sedative-hypnotics in serum by liquid chromatography/single quadrupole mass spectrometry". Forensic Science International. 157 (1): 57–70. doi:10.1016/j.forsciint.2005.03.011. PMID 15869852.
  7. ^ a b Nikaido AM, Ellinwood EH (1987). "Comparison of the effects of quazepam and triazolam on cognitive-neuromotor performance". Psychopharmacology. 92 (4): 459–64. doi:10.1007/bf00176478. PMID 2888152. S2CID 13162524.
  8. ^ Ba BB, Iliadis A, Cano JP (1989). "Pharmacokinetic modeling of ethyl loflazepate (Victan) and its main active metabolites". Annals of Biomedical Engineering. 17 (6): 633–46. doi:10.1007/bf02367467. PMID 2574017. S2CID 31310535.
  9. ^ Davi H, Guyonnet J, Necciari J, Cautreels W (July 1985). "Determination of circulating ethyl loflazepate metabolites in the baboon by radio-high-performance liquid chromatography with injection of crude plasma samples: comparison with solvent extraction and thin-layer chromatography". Journal of Chromatography. 342 (1): 159–65. doi:10.1016/S0378-4347(00)84498-9. PMID 2864352.
  10. ^ Manchester KR, Maskell PD, Waters L (March 2018). "a and plasma protein binding values for benzodiazepines appearing as new psychoactive substances" (PDF). Drug Testing and Analysis. 10 (8): 1258–1269. doi:10.1002/dta.2387. PMID 29582576.