Quercus suber Fagaceae

Friedelin (friedelane triterpene) Ceratopetalum petalum (Cunoniaceae), Quercus suber (Fagaceae) [cork], Viola odorata (Violaceae), lichens PKA... 

C30H30O, Mr 426.73, needles, mp. 267-269 °C, [aJu -27.8 (CHCI3). A pentacyclic " triterpene widely distributed in many higher plants and lichens it can be obtained as the main component from the cork of the cork oak (Quercus suber, Fagaceae) by extraction with hot ethanol. F. has diuretic activity. 

Produced by charring cork, the bark from Quercus suber L. (Fagaceae). Bouvier (1827) says that his friends call it outremer des gueux, beggar s ultramarine (Carlyle, 2001), and that it is the most blue of blacks. While it lacks intensity in mixtures, it is admirable for white draperies, skies and distances. It was also known as Spanish black, a term current to Heaton in the 1920s (Heaton, 1928). 

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