Pfizer Handbook of Microbial Metabolites 



176 



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

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



(1954). 



359 Polyporenic Acid A (Ungulinic Acid), C31H50O4, colorless nee- 

 dles, m.p. 199-200° (dec), [o^W +64° (c 1.28 in pyri- 

 dine). 



COOH 

 HO ^ 



HO 



Polyporus betulinus Fr. 



T. G. HalsaU and R. Hodge, /. Chem. Soc, 2385 (1954). 

 ( Structure ) 



360 O-Acetyleburicoic Acid, C33H50O4, colorless needles, m.p. 256— 

 259°, [aln'' +33.4° (in pyridine). 



HOOC 



CH3— C— O 



Polyporus anthracophilus 



R. M. Gascoigne, J. S. E. Holker, B. J. Ralph and Alexander 

 Robertson,-/. Chem. Soc, 2346 (1951). 



F. N. Lakey and P. H. A. Strasser, ibid., 873 (1951). 

 (Structure) 



361 Ursolic Acid (probable structure), C3(jH4).03, colorless crystals, 

 m.p. 291-292°, [(xU~' +72° (in 1:1 chloroform-methanol). 



