Gigantine

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| ImageFile = Gigantine v2.svg

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| IUPACName = 6,7-dimethoxy-1,2-dimethyl-3,4-dihydro-1H-isoquinolin-5-ol

| OtherNames = 1,2-Dimethyl-5-hydroxy-6,7-dimethoxy-1,2,3,4-tetrahydroisoquinoline

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| PubChem = 613653

| SMILES = CC1C2=CC(=C(C(=C2CCN1C)O)OC)OC

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| C=13 | H=19 | N=1 | O=3

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Gigantine is a tetrahydroisoquinoline alkaloid found in Carnegiea gigantea and other related cactus species.{{cite book | last=Shulgin | first=Alexander Theodore | last2=Perry | first2=Wendy E. | title=The Simple Plant Isoquinolines | publisher=Transform Press | date=2002 | isbn=978-0-9630096-2-3 | oclc=51006569 | ol=OL8521520M | url=https://books.google.com/books?id=NogvAQAAIAAJ}}{{cite journal |author=Bruhn JG, Lundström J |title=Alkaloids of Carnegiea gigantea. Arizonine, a new tetrahydroisoquinoline alkaloid |journal=Lloydia |volume=39 |issue=4 |pages=197–203 |year=1976 |pmid=957908 }} It was first discovered along with macromerine in 1967. Gigantine is found in significant quantities in many mescaline-containing cactus species, but it is unclear whether it contributes to their psychoactive effects. The compound has been suspected to be hallucinogenic based on animal studies in cats and monkeys, but has not been evaluated in humans.{{cite book | author = Keeper Trout & friends | title = Trout’s Notes on The Cactus Alkaloids Nomenclature, Physical properties, Pharmacology & Occurrences (Sacred Cacti Fourth Edition, Part C: Cactus Chemistry: Section 1) | date = 2013 | publisher = Mydriatic Productions/Better Days Publishing | url = https://troutsnotes.com/pdf/C13_CactusAlkaloids.pdf | quote = Suspected hallucinogen based on animal studies. Claimed to be hallucinogenic in monkeys and cats at 5 mg./ kg./ip.; Hodgkins et al. 1967. Apparently lacking any human evaluation. Fatal in monkeys and cats at 20 mg/kg/ip. Hodgkins et al. 1967.}}{{cite journal | vauthors = Hodgkins JE, Brown SD, Massingill JL | title = Two new alkaloids in cacti | journal = Tetrahedron Lett | volume = 14 | issue = | pages = 1321–1324 | date = April 1967 | pmid = 6044211 | doi = 10.1016/s0040-4039(00)90694-4 | url = | quote = Synthetic d,l-macromerine, natural macromerine and natural gigantine are physiologically active. Both alkaloids caused hallucinogenic reactions when tested on squirrel monkeys and cats (macromerine; 20 mg/kilo-I.P., hallucinogenic; gigantine, 20 mg/kilo-I.P., lethal; 5 mg/kilo-I.P., hallucinogenic).14 Macromerine shows "anti" adrenaline results in the turtle heart.15 [...] REFERENCES [...] (14) We wish to thank Dr. E. S. Barratt, Director, Behavioral Science Lab., Department of Neurology and Psychiatry, University of Texas Medical Branch, Galveston, Texas, for obtaining the physiological data. (15) We wish to thank S. Eppstein, M.D., for his interpretation of the E.K.G.'s and Professor E. W. Gardner of T.C.U. for assistance in obtaining the [...]}}