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Most of the 20 odd triterpenes that have been structurally determined are derived from pentacyclic hopane (94). The exceptions are friedelin (95), epifriedelanol, taraxerene, ursolic acid, and diacetyl pyxinol. [Pg.514]

Leucotylic acid (98), phlebic acid A (99), and phlebic acid B (100) are hopane derivatives with a 23-carboxylic acid from Parmelia leucotyliza yl., P. entotheiochroa Hue, and Peltigera aphthosa (L.) Willd. Diacetyl pyxinol (101), known from Pyxine endochrysina yX., possesses adammaran skeleton from X-ray analysis of 3/3, 12/3-di-/ -bromobenzoyl pyxinol. [Pg.515]

See also in sourсe #XX -- [ Pg.514 , Pg.515 ]