Pfizer Handbook of Microbial Metabolites 1 84 



374 Stipitatonic Acid, C9H4O6, yellow crystals, m.p. 237° (dec). 



OH 



X 



\ 



HO 



Penicillium stipitatum Thorn 



W. Segal, Chem. and Ind., 1040 (1957). (Isolation) 



Kozo Doi and Yoshio Kltahara, Bull. Chem. Soc. Japan 31 

 788 (1958). (Structure) 



W. Segal, Chem. and Ind., 1726 (1958). (Corrected struc- 

 ture) 



375 Puberulonic Acid, C9H4O7, fine yellow needles, m.p. 298° (dec). 



O 



Penicillium johannioli Zaleski, P. cyclopimn-viridica- 

 tum, P. puberulum Bainier and P. aurantio-virens Biourge 

 See preceding reference. 



Gunhild Aulin-Erdtman, Chem. and Ind., 29 (1951). 

 Idem., Acta Chem. Scand. 5 301 (1951). (Structure) 



376 Compound T, C10H8O4 or Ci,jHi„04, colorless crystals, m.p. 150°. 



This compound shows the typical tropolone spectrum, 

 and it is apparently a new tropolone acid. 



Penicillium stipitatum 



S. W. Tanenbaum, E. W. Bassett and M. Kaplan, Arch. 

 Biochem. and Biophys. 81 169 (1959). 



