Title: Eptazocine
CAS Registry Number: 72522-13-5
CAS Name: (1S)-2,3,4,5,6,7-Hexahydro-1,4-dimethyl-1,6-methano-1H-4-benzazonin-10-ol
Additional Names: (1S)-1,4-dimethyl-10-hydroxy-2,3,4,5,6,7-hexahydro-1,6-methano-1H-4-benzazonine
Manufacturers' Codes: ST-2121
Trademarks: Sedapain (Nichiiko)
Molecular Formula: C15H21NO
Molecular Weight: 231.33
Percent Composition: C 77.88%, H 9.15%, N 6.05%, O 6.92%
Literature References: Opioid agonist-antagonist analgesic, related to pentazocine, q.v. Prepn: M. Ikeda et al., DE 2422309; eidem, US 4008219 (1974, 1977 both to Nihon Iyakuhin Kogyo). Chromatographic study: I. Hayashi et al., Iyakuhin Kenkyu 12, 442 (1981), C.A. 95, 220196v (1981). Series of articles on pharmacological activities: Nippon Yakurigaku Zasshi 78, 599-645 (1981), C.A. 96, 62879, 79732, 79733 (1982). Opioid receptor binding study: T. Nabeshima et al., Res. Commun. Chem. Pathol. Pharmacol. 48, 173 (1985).
Derivative Type: Hydrobromide
Molecular Formula: C15H22BrNO
Molecular Weight: 312.25
Percent Composition: C 57.70%, H 7.10%, Br 25.59%, N 4.49%, O 5.12%
Properties: Crystals, mp 207-210°.
Melting point: mp 207-210°
Therap-Cat: Analgesic (narcotic).
Keywords: Analgesic (Narcotic).
EPTC Eptifibatide Equilenin Erabutoxins Erbium Sulfate

Systematic (IUPAC) name
Clinical data
Legal status Prescription only
Routes Oral
CAS number 72522-13-5
72150-17-5 (bromide)
ATC code None
PubChem CID 3042090
ChemSpider 2305268
Chemical data
Formula C15H21NO 
Mol. mass 231.333 g/mol

Eptazocine (Sedapain) is an opioid analgesic which was introduced in Japan by Morishita in 1987.[1][2][3][4] It acts as a mixed κ-opioid receptor agonist and μ-opioid receptor antagonist.[4][5][6]