Title: Clonitazene
CAS Registry Number: 3861-76-5
CAS Name: 2-[(4-Chlorophenyl)methyl]-N,N-diethyl-5-nitro-1H-benzimidazole-1-ethanamine
Additional Names: 2-p-chlorobenzyl-1-(2-diethylaminoethyl)-5-nitrobenzimidazole; 1-(b-diethylaminoethyl)-2-p-chlorobenzyl-5-nitrobenzimidazole
Molecular Formula: C20H23ClN4O2
Molecular Weight: 386.88
Percent Composition: C 62.09%, H 5.99%, Cl 9.16%, N 14.48%, O 8.27%
Literature References: Prepn: Hunger et al., Experientia 13, 400 (1957); Hoffmann et al., US 2935514 (1960 to Ciba).
Properties: Crystals, mp 75-76°.
Melting point: mp 75-76°
Derivative Type: Hydrochloride
Molecular Formula: C20H23ClN4O2.HCl
Molecular Weight: 423.34
Percent Composition: C 56.74%, H 5.71%, Cl 16.75%, N 13.23%, O 7.56%
Properties: mp 238-240°.
Melting point: mp 238-240°
Derivative Type: Methanesulfonate
Molecular Formula: C20H23ClN4O2.CH3SO3H
Molecular Weight: 482.98
Percent Composition: C 52.22%, H 5.63%, Cl 7.34%, N 11.60%, O 16.56%, S 6.64%
Properties: mp 163-166°.
Melting point: mp 163-166°
NOTE: This is a controlled substance (opiate): 21 CFR, 1308.11.
Therap-Cat: Analgesic (narcotic).
Keywords: Analgesic (Narcotic).
Status: This monograph has been retired and is no longer subject to revision or update.
Clonitrate Clonixin Clopamide Clopenthixol Cloperastine

Systematic (IUPAC) name
Clinical data
Legal status  ?
CAS number 3861-76-5
ATC code None
PubChem CID 62528
DrugBank DB01523
ChemSpider 56301 YesY
UNII S90R21A2V2 YesY
Synonyms Clonitazene
Chemical data
Formula C20H23ClN4O2 
Mol. mass 386.88 g/mol
 YesY (what is this?)  (verify)

Clonitazene is an opioid analgesic of approximately three times the potency of morphine.[citation needed] It is related to etonitazene, an opioid of significantly higher potency.