Over 25 alkaloids have been isolated from kratom. The most abundant alkaloids consist of three indoles and two oxindoles. The three indoles are mitragynine, paynanthine, and speciogynine-the first two of which appear to be unique to this species. The two oxindoles are mitraphylline and speciofoline.
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Articles in the Domain of Linguistics. An article entitled The Field of Linguistics was first published by the Linguistic Society of America in 1982. Facilitated by a Challenge Grant from the National Endowment for the Humanities, it was written to explain the discipline to the general public. A new edition was edited by Geoffrey Nunberg and Thomas Wasow in 1997. The plan is to update this page periodically and to expand the coverage of areas.