Stereo, Kekulé, skeletal formula of 7-hydroxymitragynine with an explicit hydrogen added
7-Hydroxymitragynine is a terpenoid indole alkaloid from the plant Mitragyna speciosa, commonly known as Kratom.
Preferred IUPAC name
Methyl (2E)-2-[(2S,3S,7aS,12bS)-3-ethyl-7a-hydroxy-8-methoxy-1,2,3,4,6,7,7a,12b-octahydroindolo[2,3-a]quinolizin-2-yl]-3-methoxyprop-2-enoate
Other names
7α-Hydroxy-7H-mitragynine;[1] 9-Methoxycorynantheidine hydroxyindolenine[1]
3D model (JSmol)
  • InChI=1S/C23H30N2O5/c1-5-14-12-25-10-9-23(27)20-17(7-6-8-19(20)29-3)24-21(23)18(25)11-15(14)16(13-28-2)22(26)30-4/h6-8,13-15,18,27H,5,9-12H2,1-4H3/b16-13+/t14-,15+,18+,23+/m1/s1 checkY
  • CC[C@@H]1CN2CC[C@@]3(O)C(=Nc4cccc(OC)c34)[C@@H]2C[C@@H]1\C(=C/OC)C(=O)OC
  • CC[C@@H]1CN2CC[C@@]3(O)C(=NC4=CC=CC(OC)=C34)[C@@H]2C[C@@H]1\C(=C/OC)C(=O)OC
Molar mass 414.502 g·mol−1
log P 1.266
Acidity (pKa) 12.203
Basicity (pKb) 1.794
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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7-Hydroxymitragynine is a terpenoid indole alkaloid from the plant Mitragyna speciosa, commonly known as Kratom.[2] It is often referred to as ‘7-OH’. It was first described in 1994[3] and is a natural product derived from the mitragynine present in the Kratom leaf. It is considered an oxidized derivative and active metabolite of mitragynine.[4]



After a kratom study, it was revealed that 7-OH converts into Mitragynine pseudoindoxyl.[5]

Mitragynine Pseudoindoxyl
Mitragynine Pseudoindoxyl
Mitragyna speciosa alkaloids at opioid receptors
Compound Affinities (Ki) Ratio Ref
7-Hydroxymitragynine 13.5 155 123 1:11:9 [6]
Mitragynine 7.24 60.3 1,100 1:8:152 [6]
Mitragynine pseudoindoxyl 0.087 3.02 79.4 1:35:913 [6]

See also


  1. ^ a b Chemical Abstracts Service: Columbus, OH, 2004; RN 174418-82-7 (accessed via SciFinder Scholar, version 2007.3; November 30, 2011)
  2. ^ Matsumoto K, Horie S, Ishikawa H, Takayama H, Aimi N, Ponglux D, Watanabe K (March 2004). "Antinociceptive effect of 7-hydroxymitragynine in mice: Discovery of an orally active opioid analgesic from the Thai medicinal herb Mitragyna speciosa". Life Sciences. 74 (17): 2143–55. doi:10.1016/j.lfs.2003.09.054. PMID 14969718.
  3. ^ Ponglux, Dhavadee; Wongseripipatana, Sumphan; Takayama, Hiromitsu; Kikuchi, Masae; Kurihara, Mika; Kitajima, Mariko; Aimi, Norio; Sakai, Shin-ichiro (1994). "A New Indole Alkaloid, 7 α-Hydroxy-7H-mitragynine, from Mitragyna speciosa in Thailand". Planta Medica. 60 (6): 580–581. doi:10.1055/s-2006-959578. ISSN 0032-0943. PMID 17236085.
  4. ^ "7-Hydroxymitragynine - Green Leaf Kratom - Kratom Blogs Archives". Green Leaf Kratom. 2020-08-19. Retrieved 2020-08-22.
  5. ^ Váradi A, Marrone GF, Palmer TC, Narayan A, Szabó MR, Le Rouzic V, Grinnell SG, Subrath JJ, Warner E, Kalra S, Hunkele A, Pagirsky J, Eans SO, Medina JM, Xu J, Pan YX, Borics A, Pasternak GW, McLaughlin JP, Majumdar S (2016). "Mitragynine/Corynantheidine Pseudoindoxyls As Opioid Analgesics with Mu Agonism and Delta Antagonism, Which Do Not Recruit β-Arrestin-2". J. Med. Chem. 59 (18): 8381–97. doi:10.1021/acs.jmedchem.6b00748. PMC 5344672. PMID 27556704.
  6. ^ a b c Takayama H, Ishikawa H, Kurihara M, Kitajima M, Aimi N, Ponglux D, Koyama F, Matsumoto K, Moriyama T, Yamamoto LT, Watanabe K, Murayama T, Horie S (2002). "Studies on the synthesis and opioid agonistic activities of mitragynine-related indole alkaloids: discovery of opioid agonists structurally different from other opioid ligands". J. Med. Chem. 45 (9): 1949–56. doi:10.1021/jm010576e. PMID 11960505.