ARC 239 dihydrochloride hydrate

≥98% (HPLC)

(2-[2-[4-(o-Methoxyphenyl)piperazin-1-yl]ethyl]-4,4-dimethyl-1,3-(2H,4H)-isoquinolinedione dihydrochloride hydrate
Empirical Formula (Hill Notation):
C24H29N3O3·2HCl · xH2O
Molecular Weight:
480.43 (anhydrous basis)
MDL number:
PubChem Substance ID:
Pricing and availability is not currently available.

Quality Level


≥98% (HPLC)




white to off-white


H2O: >5 mg/mL

storage temp.


SMILES string




InChI key



ARC 239 is a potent α-adrenoceptor blocking drug, competitively antagonizing pressor responses to adrenaline and inhibiting pressor responses to noradrenaline, phenylephrine, tyramine, and dimethylphenylpiperazinium.


5 mg in glass bottle

Biochem/physiol Actions

ARC 239 is a selective α-2B adrenergic blocker. Although ARC-239, like prazosin, also has some alpha-1 antagonist activity, it is used most commomly to differentiate alpha-2A/D from alpha-2B and alpha-2C subtypes rather than for any alpha-1 inhibition..


Exclamation markEnvironment

Signal Word


Hazard Statements

Precautionary Statements


UN 3077 9 / PGIII

WGK Germany


Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis
Certificate of Origin
L F Callado et al.
European journal of pharmacology, 366(1), 35-39 (1999-03-04)
In this study, we used subtype-selective antagonists to determine the subtype of alpha2-adrenoceptor controlling noradrenaline release in rat locus coeruleus. Noradrenaline release was measured in locus coeruleus slices using fast cyclic voltammetry at carbon fibre microelectrodes. On long stimulation trains...
L F Callado et al.
Life sciences, 64(25), 2327-2339 (1999-06-22)
The profile of [3H]RX821002 (2-methoxy idazoxan) binding to alpha2-adrenoceptor subtypes in rat kidney membranes was evaluated in controls and after chronic treatment with desipramine (10 mg/kg, i.p., every 12 h, 7 days) or clorgyline (2 mg/kg, i.p., every 24 h...
A Bencsics et al.
Brain research, 705(1-2), 302-306 (1995-12-24)
Exogenous pyrogens, e.g., bacterial lipopolysaccharides (LPS), are thought to stimulate macrophages to release endogenous pyrogens, e.g., TNF alpha, IL-1 beta, and IL-6, which act in the hypothalamus to produce fever. We studied the effect of different alpha 1- and alpha...
M Taoda et al.
Neurochemistry international, 38(4), 317-322 (2001-01-04)
The presynaptic modulation of [3H]-noradrenaline (NA) release from rat kidney cortex slices, a method used for the first time, was investigated. Rat kidney cortex slices were loaded with [3H]-NA and the release of radioactivity at rest and in response to...
S E Hopwood et al.
Neuropharmacology, 41(4), 433-442 (2001-09-07)
The rat rostral raphé nuclei receive catecholaminergic innervation from the locus coeruleus and other areas. In the present study, we investigated noradrenergic modulation of 5-HT release in rat dorsal and median raphé nuclei (DRN and MRN) slices (350 microm thick)...

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