EPELSIBAN BESYLATE

Investigational

Details

Stereochemistry	ABSOLUTE
Molecular Formula	C30H38N4O4.C6H6O3S
Molecular Weight	676.822
Optical Activity	UNSPECIFIED
Defined Stereocenters	4 / 4
E/Z Centers	0
Charge	0

SHOW SMILES / InChI

Structure Search

SMILES

OS(=O)(=O)C1=CC=CC=C1.CC[C@H](C)[C@H]2N([C@@H](C(=O)N3CCOCC3)C4=CC=C(C)N=C4C)C(=O)[C@H](NC2=O)C5CC6=C(C5)C=CC=C6

InChI

InChIKey=BEWUOCYETMDWGE-FKDQZALLSA-N

InChI=1S/C30H38N4O4.C6H6O3S/c1-5-18(2)26-28(35)32-25(23-16-21-8-6-7-9-22(21)17-23)29(36)34(26)27(24-11-10-19(3)31-20(24)4)30(37)33-12-14-38-15-13-33;7-10(8,9)6-4-2-1-3-5-6/h6-11,18,23,25-27H,5,12-17H2,1-4H3,(H,32,35);1-5H,(H,7,8,9)/t18-,25+,26+,27+;/m0./s1

HIDE SMILES / InChI

Molecular Formula	C30H38N4O4
Molecular Weight	518.6471
Charge	0
Count

Stereochemistry	ABSOLUTE
Additional Stereochemistry	No
Defined Stereocenters	4 / 4
E/Z Centers	0
Optical Activity	UNSPECIFIED

Molecular Formula	C6H6O3S
Molecular Weight	158.175
Charge	0
Count

Stereochemistry	ACHIRAL
Additional Stereochemistry	No
Defined Stereocenters	0 / 0
E/Z Centers	0
Optical Activity	NONE

Description
Sources: https://www.ncbi.nlm.nih.gov/pubmed/22239250 | https://adisinsight.springer.com/drugs/800033691

Epelsiban (GSK557296), a pyridyl-2,5-diketopiperazine, is a potent, highly selective, and orally bioavailable non-peptide oxytocin receptor antagonist. GlaxoSmithKline was developing epelsiban for the treatment of women infertility due to adenomyosis and premature ejaculation.

Originator

Approval Year

Targets

Primary Target	Pharmacology	Condition	Potency
Oxytocin receptor 19 Target ID: P30559 Gene ID: 5021.0 Gene Symbol: OXTR Target Organism: Homo sapiens (Human) Sources: https://www.ncbi.nlm.nih.gov/pubmed/22239250	Antagonist 2849		9.9 null [pKi]

PubMed

Title	Date	PubMed
Single- and Multiple-Day Dosing Studies to Investigate High-Dose Pharmacokinetics of Epelsiban and Its Metabolite, GSK2395448, in Healthy Female Volunteers.	2018-01	28556598
A single- and multiple-dose study to investigate the pharmacokinetics of epelsiban and its metabolite, GSK2395448, in healthy female volunteers.	2015-11	27137713
Safety and efficacy of epelsiban in the treatment of men with premature ejaculation: a randomized, double-blind, placebo-controlled, fixed-dose study.	2013-10	23937679
Inhibition of ejaculation by the non-peptide oxytocin receptor antagonist GSK557296: a multi-level site of action.	2013-08	23530818
Pyridyl-2,5-diketopiperazines as potent, selective, and orally bioavailable oxytocin antagonists: synthesis, pharmacokinetics, and in vivo potency.	2012-01-26	22239250

Patents

Sample Use Guides

In Vivo Use Guide

phase I studies: at total daily doses of 600 and 900 mg, epelsiban was generally well tolerated, and there were no significant safety concerns identified.

Route of Administration: Oral

Substance Class	Chemical Created by `admin` on `Mon Mar 31 20:16:54 GMT 2025` Edited by `admin` on `Mon Mar 31 20:16:54 GMT 2025`
Record UNII	H629P9T4UN
Record Status	`Validated (UNII)`
Record Version

Download

Name

Type

Language

EPELSIBAN BESYLATE

Official Name

English

GSK-557296B

Preferred Name

English

2,5-PIPERAZINEDIONE, 3-(2,3-DIHYDRO-1H-INDEN-2-YL)-1-((1R)-1-(2,6-DIMETHYL-3-PYRIDINYL)- 2-(4-MORPHOLINYL)-2-OXOETHYL)-6-((1S)-1-METHYLPROPYL)-, (3R,6R)-, BENZENESULFONATE (1:1)

Common Name

English

EPELSIBAN BESYLATE [USAN]

Common Name

English

GSK557296B

Code

English

(3R,6R)-3-(2,3-DIHYDRO-1H-INDEN-2-YL)-1-((1R)-1-(2,6-DIMETHYLPYRIDIN-3-YL)-2-(MORPHOLIN-4-YL)-2-OXOETHYL)-6-((1S)-1-METHYLPROPYL)PIPERAZINE-2,5-DIONE MONOBENZENESULFONATE

Common Name

English

Classification Tree Code System Code

NCI_THESAURUS

C98292