Pfizer Handbook of Microbial Metabolites io6 



187 Neurosporaxanthin, dark grayish purple leaflets, m.p. 192° 



(vac), U.V. 472 m^ in hexane (486 m^ in benzene). 



An uncharacterized carotenoid which gives yellow so- 

 lutions and a red color adsorbed on sucrose. 



Neiirospora crassa 



Marko Zalokar, Arch. Biochem. and Biophys. 70 568 

 (1957). (Isolation) 



188 Leprotene (Leprotin), coppery red needles, m.p. 197°, U.V. 429, 



452, 479 rriyu in petroleum ether. 



The principal carotene of Mycobacterium phlei and 

 other mycobacteria. It contains no ionone rings and does 

 not function as a provitamin A. 



Yoshiharu Takeda and Tatsuo Ohta, J. Biochem. Japan 36 

 535 (1944). (Isolation) 



Tatsuo Ohta, /. Pharm. Soc. Japan 71 462 (1951). 



189 Mycoxanthin, U.V. 385, 406, 430 m^ in petroleum ether. 



A new yellow carotenoid with a relatively short chromo- 



phore. 



Mycobacterium phlei, M. marianurn, M. battaglini 

 Aldo Gaudiano, Atti. accad. nazl. Lincei, Rend., Classe set. 



fis., mat. e nat. 21 308 (1956). (Chem. Abstr. 51 8876 f) 



(Isolation) 



