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Longjack (Eurycoma Longifolia Jack / Tongkat Ali / Malaysian Ginseng / Pasak Bumi) is a bitter tasting herb extracted from the Eurycoma shrub grown in Malaysia and Asia. The Eurycoma Longifolia Jack extract is taken from the roots of the plant.

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Longjack Research
Structure of laurycolactone A and B, new C18 - quassinoids from Eurycoma longifolia and revised structured of Eurycomalactone (X - ray analysis)
Laurycolactone A and B are new quassinoids with a C18 basic skeleton isolated from the Vietnamese Simaroubaceae, Eurycoma longifolia Jack. The structure of Eurycomalactone, a C19 quassinoid isolated previously from the same plant, has been revised and shown to be . The structures have been established by spectral means and those of and confirmed by X-ray diffraction analysis.

Eurycomanone and eurycomanol, quassinoids from the roots of Eurycoma longifolia From the roots of Eurycoma longifolia, used as an Indonesian folk medicine, two highly oxygenated quassinoids, named eurycomanone and eurycomanol were isolated. The structures of both new bitter principles were elucidated by NMR, MS, UV and IR.
Author Keywords: Eurycoma longifolia; Simaroubaceae; quassinoids; eurycomanone; eurycomanol.

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