From Radula laxiramea, 12 bibenzyl derivatives and the common bisbibenzyl perrottetin E were isolated. Two compounds are described for the first time as natural products, and one, previously only known after derivatisation, was found in genuine form . Perrottetinene, a cannabinoid from a liverwort is worth mentioning.
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Cullmann et al. (1999) studied this question.