U69593, (+)-(5α,7α,8β)-N-Methyl-N-[7-(1-pyrrolidinyl)-1-oxaspiro[4.5]dec-8-yl]-benzeneacetamide
Empirical Formula (Hill Notation):
CAS Number:
Molecular Weight:
MDL number:
PubChem Substance ID:

Quality Level



optical activity

[α]/D +7.8°, c = 0.825 in methanol(lit.)




45% (w/v) aq 2-hydroxypropyl-β-cyclodextrin: 10 mg/mL
0.1 M HCl: >40 mg/mL
ethanol: >40 mg/mL
0.1 M NaOH: insoluble
H2O: insoluble

storage temp.


SMILES string




InChI key


Gene Information

human ... OPRD1(4985), OPRK1(4986), OPRM1(4988)
mouse ... Oprk1(18387)
rat ... Oprd1(24613), Oprk1(29335), Oprm1(25601)

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5 mg in glass bottle
25 mg in poly bottle

Biochem/physiol Actions

U-69593 is a selective κ opioid receptor agonist. U-69593 is known to inhibit cocaine sensitization in meso-limbic dopamine neurons by normalizing basal overflow of dopamine.

Features and Benefits

This compound is also offered as part of Sigma′s Library of Pharmacologically Active Compounds (LOPAC®1280), a biologically annotated collection of high-quality, ready-to-screen compounds. Click here to learn more.

Preparation Note

U-69593 is soluble in 45% (w/v) aq 2-hydroxypropyl-β-cyclodextrin (10 mg/ml), 0.1 M HCl (>40 mg/ml), and ethanol (>40 mg/ml). However, it is insoluble in 0.1 M NaOH and water.

Legal Information

LOPAC is a registered trademark of Sigma-Aldrich Co. LLC

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves


NONH for all modes of transport

WGK Germany


Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis
Certificate of Origin
Lisa E Baker et al.
Psychopharmacology, 203(2), 203-211 (2009-01-21)
Research interests regarding the psychopharmacology of salvinorin A have been motivated by the recreational use and widespread media focus on the hallucinogenic plant, Salvia divinorum. Additionally, kappa opioid (KOP) receptor ligands may have therapeutic potential in the treatment of some...
Xu Zhang et al.
Behavioural brain research, 236(1), 8-15 (2012-09-04)
Within a biopsychosocial model of pain, pain is seen as a conscious experience modulated by mental, emotional and sensory mechanisms. Recently, using a rodent visceral pain assay that combines the colorectal distension (CRD) model with the conditioned place avoidance (CPA)...
Reagan L Pennock et al.
The Journal of neuroscience : the official journal of the Society for Neuroscience, 31(1), 281-288 (2011-01-07)
Hypothalamic proopiomelanocortin (POMC) neurons release the endogenous opioid beta-endorphin and POMC neuron activity is inhibited by opioids, leading to the proposal that beta-endorphin acts to provide feedback inhibition. However, both intrinsic properties and synaptic inputs contribute to the regulation of...
Miriam Stoeber et al.
eLife, 9 (2020-02-26)
G protein-coupled receptors (GPCRs) signal through allostery, and it is increasingly clear that chemically distinct agonists can produce different receptor-based effects. It has been proposed that agonists selectively promote receptors to recruit one cellular interacting partner over another, introducing allosteric...
C A Heidbreder et al.
Neuroreport, 5(14), 1797-1800 (1994-09-08)
Repeated intermittent administration of cocaine (20 mg kg-1, i.p.) for 3 days dramatically increased basal dopamine (DA) overflow in the nucleus accumbens (ACB) 48 h after the final daily injection. This cocaine pretreatment also produced a significant increase in stereotypy...

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