Ethylpropyllysergamide

Pharmaceutical compound From Wikipedia, the free encyclopedia

N-Ethyl-N-propyllysergamide (EPLA), also known as lysergic acid ethylpropylamide (LEP or LEP-57), is a psychedelic drug of the lysergamide family related to lysergic acid diethylamide (LSD).^[5]^[2]^[3]^[1]^[6]^[4] It is the analogue of LSD in which the amide group has one ethyl group and one propyl group instead of two ethyl groups.^[5]^[2]^[3]^[1]^[6]^[4]

Other namesN-Ethyl-N-propyllysergamide; Ethylpropyllysergamide; EPLA; Lysergic acid ethylpropylamide; LEP; LEP-57; N-Ethyl-6-methyl-N-propyl-9,10-didehydroergoline-8β-carboxamide

Routes of
administrationOral^[1]^[2]^[3]^[4]

Drug classSerotonin receptor modulator; Serotonin 5-HT_2A receptor agonist; Serotonergic psychedelic; Hallucinogen

ATC code

None

Quick facts Clinical data, Other names ...

EPLA
Clinical data


Other names	N-Ethyl-N-propyllysergamide; Ethylpropyllysergamide; EPLA; Lysergic acid ethylpropylamide; LEP; LEP-57; N-Ethyl-6-methyl-N-propyl-9,10-didehydroergoline-8β-carboxamide
Routes of administration	Oral^[1]^[2]^[3]^[4]
Drug class	Serotonin receptor modulator; Serotonin 5-HT_2A receptor agonist; Serotonergic psychedelic; Hallucinogen
ATC code	None
Identifiers
IUPAC name (6aR,9R)-N-ethyl-7-methyl-N-propyl-4,6,6a,7,8,9-hexahydroindolo[4,3-fg]quinoline-9-carboxamide
PubChem CID	166935919
Chemical and physical data
Formula	C₂₁H₂₇N₃O
Molar mass	337.467 g·mol⁻¹
3D model (JSmol)	Interactive image
SMILES CCCN(C(=O)[C@H]1CN(C)[C@H]2C(=C1)c1cccc3c1c(C2)c[nH]3)CC
InChI InChI=1S/C21H27N3O/c1-4-9-24(5-2)21(25)15-10-17-16-7-6-8-18-20(16)14(12-22-18)11-19(17)23(3)13-15/h6-8,10,12,15,19,22H,4-5,9,11,13H2,1-3H3/t15-,19-/m1/s1 Key:LRVSYILBFXYJOP-DNVCBOLYSA-N

The drug shows affinity for serotonin receptors and acts as a serotonin 5-HT_2A receptor agonist similarly to LSD.^[5] EPLA has about one-third of the potency of LSD in producing psychedelic effects in humans.^[1]^[2]^[3]^[4] Its exact dose has not been reported.^[6]

EPLA was first described in the scientific literature by at least 1959.^[7]^[8] It was reportedly encountered as a designer drug by the 1990s.^[9]

References

[1]
Shulgin AT (1980). "Hallucinogens". In Burger A, Wolf ME (eds.). Burger's Medicinal Chemistry. Vol. 3 (4 ed.). New York: Wiley. pp. 1109–1137. ISBN 978-0-471-01572-7. OCLC 219960627. Table 60.4 Hallucinogenic Lysergic Acid Amides [...]
[2]
Shulgin AT (1982). "Chemistry of Psychotomimetics". In Hoffmeister F, Stille G (eds.). Psychotropic Agents, Part III: Alcohol and Psychotomimetics, Psychotropic Effects of Central Acting Drugs. Handbook of Experimental Pharmacology. Vol. 55. Berlin: Springer Berlin Heidelberg. pp. 3–29. doi:10.1007/978-3-642-67770-0_1. ISBN 978-3-642-67772-4. OCLC 8130916.
[3]
Shulgin AT (1976). "Psychotomimetic Agents". In Gordon M (ed.). Psychopharmacological Agents: Use, Misuse and Abuse. Medicinal Chemistry: A Series of Monographs. Vol. 4. Academic Press. pp. 59–146. doi:10.1016/b978-0-12-290559-9.50011-9. ISBN 978-0-12-290559-9.
[4]
Pfaff RC, Huang X, Marona-Lewicka D, Oberlender R, Nichols DE (1994). "Lysergamides revisited". NIDA Research Monograph. 146: 52–73. PMID 8742794. The other major area now being examined is substitution on the amide function. Most lysergamides that have been subjected to clinical studies were reported in the mid- to late-1950s. Table 2 lists relative potency in humans for most of the amides that were studied. The amides were not studied systematically, and their characterization in clinical studies was rudimentary. [...] TABLE 2. Relative human potency of lysergic acid amides* [...] It should be noted in table 2 that none of the compounds has more than about 30 percent of the activity of LSD. This is something that has always perplexed researchers in this field: What is it about the diethyl group that may be unique in this molecule? Even a substitution with the same number of carbon atoms, such as the N-methyl-N-propyl derivative, shows only about one-thirtieth the potency of LSD. The N-methyl-N-propyl presumably would have similar pharmacokinetics, with comparable amounts of the drug expected to enter the brain, and yet this compound is only weakly active. Even the N-methyl-N-ethyl has low activity compared with LSD. With the N,N-diethyl (LSD) one sees optimum activity, but the N-ethyl-N-propyl is back to about one-third the potency of LSD, and N,N-dipropyl is down to one-tenth.
[5]
Nichols DE (2018). Chemistry and Structure-Activity Relationships of Psychedelics. Current Topics in Behavioral Neurosciences. Vol. 36. pp. 1–43. doi:10.1007/7854_2017_475. ISBN 978-3-662-55878-2. PMID 28401524.
[6]
Shulgin AT (2003). "Basic Pharmacology and Effects". In Laing RR (ed.). Hallucinogens: A Forensic Drug Handbook. Forensic Drug Handbook Series. Elsevier Science. pp. 67–137. ISBN 978-0-12-433951-4. Retrieved 1 February 2025. Table 3.23 Amide analogues and pyrrole derivatives of LSD [...]
[7]
Hofmann A (June 1959). "Psychotomimetic drugs; chemical and pharmacological aspects" (PDF). Acta Physiologica et Pharmacologica Neerlandica. 8: 240–258. PMID 13852489. Systematic variations of the substituents in the amide grouping has resulted in the synthesis of a great number of substances (STOLL and HOFMANN, 1955) which are listed in table 1. Pharmacological and clinical investigations of this group of compounds have not yet been concluded. None of these compounds shows the high specific psychic activity of LSD. The next higher and the next lower homologue of LSD, the lysergic acid dimethylamide and the dipropylamide, are about ten times less active on the psyche, but the vegetative effects are the same as that of the diethylamide. But there are some derivatives which have other interesting psychic effects, for example the monoethylamide and the unsubstituted amide show some sedative or even hypnotic effects. [...] TABLE 1 Variations in the acid amide group of the LSD molecule [...]
[8]
Abramson HA, Rolo A (September 1965). "Lysergic acid diethylamide (LSD-25). 38. Comparison with action of methysergide and psilocybin on test subjects". The Journal of Asthma Research. 3 (1): 81–96. doi:10.3109/02770906509106904. PMID 5318626.
[9]
Valter K, Arrizabalaga P, Landry J (1998). Designer Drugs Directory. Elsevier Science. p. 79. ISBN 978-0-08-053032-1. Retrieved 9 March 2025. 2.2 LSD Analogues Being extremely potent and relatively easy to produce, LSD (1, R1=R2=Et;) is a drug particularly suited for illicit traffic. Several procedures for its manufacture have been developed and mastered by clandestine chemists [1]. However, diethylamine, the key precursor in LSD synthesis is a highly suspect and closely controlled chemical and has been occasionally replaced by another suitable dialkylamine [2]. Consequently, in spite of their generally lower potency, several LSD analogues have sporadically been detected on the drug market. Thus, the ethylpropylamide (LEP-57; 1, R1=Et; R2=n-Pr) shows about 50% of LSD psychotomimetic activity in man. The morpholide (2) and the methylpropylamide (LMP-55, LAMPA; 1, R1=Me; R2=n-Pr) [7] are still less active (30% [3], 10-15 % [4,5], respectively). The identification of these substances was described in several recent papers [6].

Ethylpropyllysergamide

See also

References

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