Radula laxiramea

The ethane bridge of compound 167 from the roots of Deguelia hatschbachii A. M. G. Azevedo was oxygenated to be a keto [47]. Racemosol and demethylracemosol, together with their possible biogenetic precursors, preracemosols A and B (175, 176), were isolated from the roots of Bauhinia malabarica Roxb, in which methylation occurred at C-4 position [101]. From Radula laxiramea, twelve bibenzyl derivatives and the common bisbibenzyl perrottetin E were isolated. 

It was believed for a long time that cannabinoids occurred only in hemp, until perrottetinene was discovered in 1994 in the small leafy-stern liverwort (Radula perrottetii). Later, this compound was also found in Radula laxiramea, and along with its carboxylic acid in the New Zealand liverwort (Radula mar-ginata) as well. [119] At the present time, around 70 phytocannabinoids (i.e. plant-derived cannabinoids) are known. 

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