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Systematic (IUPAC) name
(R)-4- [(E)-3-phosphonoprop-2-enyl]piperazine- 2-carboxylic acid
CAS number 137424-80-7
ATC code  ?
PubChem 6437356
Chemical data
Formula C 8H15N2O5P 
Mol. mass 250.189 g/mol
SMILES eMolecules & PubChem
Synonyms CPPene, Midafotel, SDZ EAA 494
Pharmacokinetic data
Bioavailability  ?
Metabolism  ?
Half life  ?
Excretion Renal
Therapeutic considerations
Pregnancy cat.  ?
Legal status
Routes  ?

CPPene (Midafotel, SDZ EAA 494) is a potent competitive antagonist at the NMDA receptor.[1] It was originally designed as a potential therapy for excitotoxicity,[2] epilepsy or neuropathic pain.[3] It looked very promising in in vitro trials proving to be a potent competitive antagonist at the NMDA without affecting other receptors.[4] Research continued through to in vivo cat studies where it proved to limit damage after occluding the middle cerebral artery leading to ischaemia. It also blocked photosensitive epilepsies in baboons.[5]

CPPene had a pharmacokinetic profile suitable for progressing to clinical trials as it has no toxic by products, is excreted exclusively via the renal system and remains unchanged in the brain.

However CPPene was removed from clinical trials as it provided no suitable neuronal protection or beneficial treatment for epilepsy,[6] and had side effects which led to many patients withdrawing from trials.[7] A possible explanation for its lack of efficacy in trials is the relatively short therapeutic time window following ischaemic damage and the fact that a small amount of glutamate helps neuronal survival. It is also believed that some "pro-survival" genes are activated by NMDA receptors.


  1. ^ Lowe DA, Neijt HC, Aebischer B. D-CPP-ene (SDZ EAA 494), a potent and competitive N-methyl-D-aspartate (NMDA) antagonist: effect on spontaneous activity and NMDA-induced depolarizations in the rat neocortical slice preparation, compared with other CPP derivatives and MK-801. Neuroscience Letters. 1990 Jun 8;113(3):315-21. PMID 2166255
  2. ^ Bullock R, McCulloch J, Graham DI, Lowe D, Chen MH, Teasdale GM. Focal ischemic damage is reduced by CPP-ene studies in two animal models. Stroke. 1990 Nov;21(11 Suppl):III32-6. PMID 2146780
  3. ^ Bespalov A, Kudryashova M, Zvartau E. Prolongation of morphine analgesia by competitive NMDA receptor antagonist D-CPPene (SDZ EAA 494) in rats. European Journal of Pharmacology. 1998 Jun 26;351(3):299-305. PMID 9721021
  4. ^ Lowe DA, Emre M, Frey P, Kelly PH, Malanowski J, McAllister KH, Neijt HC, Rüdeberg C, Urwyler S, White TG, et al. The pharmacology of SDZ EAA 494, a competitive NMDA antagonist. Neurochemistry International. 1994 Dec;25(6):583-600. PMID 7894335
  5. ^ Patel S, Chapman AG, Graham JL, Meldrum BS, Frey P. Anticonvulsant activity of the NMDA antagonists, D(-)4-(3-phosphonopropyl) piperazine-2-carboxylic acid (D-CPP) and D(-)(E)-4-(3-phosphonoprop-2-enyl) piperazine-2-carboxylic acid (D-CPPene) in a rodent and a primate model of reflex epilepsy. Epilepsy Research. 1990 Sep-Oct;7(1):3-10. PMID 2292244
  6. ^ Sveinbjornsdottir S, Sander JW, Upton D, Thompson PJ, Patsalos PN, Hirt D, Emre M, Lowe D, Duncan JS. The excitatory amino acid antagonist D-CPP-ene (SDZ EAA-494) in patients with epilepsy. Epilepsy Research. 1993 Oct;16(2):165-74. PMID 8269915
  7. ^ Rockstroh S, Emre M, Tarral A, Pokorny R. Effects of the novel NMDA-receptor antagonist SDZ EAA 494 on memory and attention in humans. Psychopharmacology (Berlin). 1996 Apr;124(3):261-6. PMID 8740048


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