Abstract
The investigation of a further South African Helichrysum species afforded eleven resorcinol derivatives, most of them closely related to cannabigerol and the corresponding acid, both also being present in the aerial parts of H. umbraculigerum. Furthermore a new geranyl chalcone is present. The structures are elucidated by spectroscopic methods and some chemical transformations. The occurrence of the cannabigerol-like compounds in a composite is surprising. Probably, some of these compounds are formed by the combination of three different biogenetic pathways.
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