Pfizer Handbook of Microbial Metabolites 244 



502 Isooosporein,* C14H10O8, purple crystals, no m.p., subl. 220- 

 250°, dec. 250°. 



O 



HO-// A // 



Unclassified citric acid-forming fungus. 

 Maximal yield 2.5 g. per liter. 



Nobuyo Shigematsu, ]. Inst. Polytech., Osaka City Univ. 

 Ser. C 5 100 (1956). 



503 Volucrisporin, C18H12O4, red plates, m.p. >300°. 



HO 



o W 



OH 



Volucrispora aurantiaca 



Occasionally small quantities of the leuco derivative 

 (hydroquinone) occur with the pigment. 



P. V. Divekar, G. Read and L. C. Vining, Chem. and Ind., 

 731 (1959). 



504 Polyporic Acid, C18H12O4, bronze leaflets, m.p. 305-307° (dec). 



? OH 



/ 

 HO " 

 O 



Polyporus nidulans Fries, P. rutilans (Pers.) Fries, 

 Peniophora fdamentosa (B. and C.) Burt, Sticta coronata 

 Muell., S. colensoi Bab. 



Fritz Kogl, Ann. 465 243 (1928). 



J. Murray, J. Chem. Soc, 1345 (1952). 



* See addendum. 



