Sticta coronata

C gH 204, Mr 292.29, bronze-colored plates, mp. 310-312°C. P. forms red solvates from pyridine and yellow solvates from dioxan it has the parent skeleton of the terphenylquinones. P. is found in some tree fungi of the order Aphyllophorales and in the frondous lichen Sticta coronata. The cinnamon-colored fruit bodies of Hapalopilus rutilans consist of up to 43.5% dry weight of polyporic acid. P. is formed biosynthet-ically by condensation of two molecules of phenyl-pyruvic acid and exhibits weak antileukemic activity. The dimethylether is called betulinan A . 

Chiarello J, Joullie MM (1988) Synthetic routes to cristatic acid and derivatives. Tetrahedron 44 41-48 Chin WJ, Corbett RE, Heng CK, Wilkins AL (1973) Lichens and fungi. Part XL Isolation and structural elucidation of a new group of triterpenes from Sticta coronata, S. colensoi, and S. flavicans. J Chem Soc Perkin Trans 1 1437-1446... 

Chin, W. J., R. E. Corbett, C. K. Heng, and A. L. Wilkins Lichens and Fungi. Part XL Isolation and Structural Elucidation of a New Group of Triterpenes from Sticta coronata, S. colensoi, and S.flavicans. J. Chem. Soc. (London) Perkin Trans. I 1973, 1437. 

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