267 



Anthraquinones 



Maeda, Tadashi Yamamoto and Seizaburo Yamaoka, /. Anti- 

 biotics (Japan) 6A 45 (1953). 



Teisuke Osato, Koki Yagishita, Ryozo Utahara, Masahiro 

 Ueda, Kenji Maeda and Hamao Umezawa, ibid. 6A 52 (1953). 



Berislav Govorcin, Tehnicki Pregled 8 43 (1956). 



578 Luteoleersin, C.uH.isOy, yellow crystals, m.p. 135°, [(z]r,46i" 214° 



(c 0.456 in ethanol). 



Believed to be a substituted quinone, containing two 

 active hydrogens. It was accompanied by a reduction 

 product : 



579 Alboleersin, CoeH^nO^, colorless crystals, m.p. 215°, [a].r546i^^ 



274° (c 6.430 in ethanol). 



Contains three active hydrogens. 



Helmiiithosporiuin leersii Atkinson 



Julius N. Ashley and Harold Raistrick, Biochem. J. 32 449 

 (1938). 



580 Skyrin (Endothianin), C;^„HisOt,i, dark orange rods, m.p. 



>380°. 



Penicillium islandicum Sopp, P. wortmanni Klocker, P. 

 tardum Thom, P. rugulosum Thorn, Endothia parasitica 

 (Murr. ) Anderson and Anderson, E. fiuens Shear and 

 Stevens 



All of these fungi produce a mixture of skyrin with 

 rugulosin. 



F. Kogl and F. S. Quackenbush, Rec. trav. chim. 63 251 

 (1944). 



