175 



Terpenoids and Steroids 



Polyporus tumulosus Cooke, P. australiensis Wakefield, 

 P. betuliuus. Porta cocos 



This acid has never been separated completely from its 

 mixture with tumulosic aicd, but the structure has been 

 deduced from physical measurements. 



L. A. Cort, R. M. Gascoigne, J. S. E. Holker, B. J. Ralph, 

 Alexander Robertson and J. J. H. Simes, J. Chem. Soc, 3713 

 (1954). 



357 Eburicoic Acid, C;,,H-,„0;., colorless crystals, m.p. 292-293°, 

 [a]i,'" +50° (c 1.2 in chloroform). 



HOOC 



Polyporus officinalis Fr., P. anthracophihis, Cooke, P. 

 eucalyptorum Fr., P. sulfiireiis (Bull.) Fr., P. hispidus 

 (Bull.) Fr., Porta cocos (Schw.) Wolf, Lentinus dacty- 

 loides Cleland. 



The yield is 50% of the dry mycelial weight in some 

 cases. The S^g-acetate also occurs naturally in at least 

 some of these basidiomycetes. 



J. S. E. Holker, A. D. G. Powell, Alexander Robertson, 

 J. J. H. Simes, R. S. Wright and (in part) R. M. Gascoigne, /. 

 Chem. Soc, 2422 (1953). (Structure) 



358 Tumulosic Acid, Ci^H-.^O^, colorless fine needles, m.p. 306° 

 (dec), [a]„ +8.1° (c 3.30 in pyridine). 



HOOC 



Polyporus tumulosus Cooke, P. australiensis Wakefield, 

 P. betulinus Fr., Porta cocos Wolf, Porta cocos (Schw.) 

 Wolf (syn. Pachyma hoelen Rumph.) 



