Helichrysum acutatum

Bohlmann F, Abraham W-R 1979 Neue Diterpen aus Helichrysum acutatum. Phytochemistry 18 1754-1756... 

Greenmaniella resinosa Helichrysum acutatum Helichrysum Krebsianum Helichrysun odoratissimum... 

Only a few compounds have the carbon skeleton of the geranylmenthane cation (471), mostly isolated from genus Helichrysum - e.g., peroxide 474 from roots of H. acutatum (40). Compounds of the prenylgermacrane type (472) have not, so far, been isolated from higher plants however, the bluish-red antibiotic biflorin (475), occurring in the roots of Capraria biflora (105), is an example of a type arising from further cyclization of 472 (cf. cadalanes in Sect. 8.1.3.3.2, Ses-quiterpenoids). 

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