247 Benzoquinones 



Jarl Gripenberg, Acta Chem. Scand. 10 1111 (1956). 



510 Protoleucomelone, C32HosO,4, colorless crystals, m.p. 203-205°. 

 Probable structure: 



CH3OCO ^^-^ 

 CH3OCO. I / V-OCOCHs 

 CH3COO \r^^/ \=/ 



CHaOCO-f y y ^OCOCH3 



OCOCH3 



Polyporus leiicomelas Pers. ex Fr. 



Yield 3-4 g. per kilogram of mushrooms. 



Masuo Akagi, /. Pharm. Soc. Japan 62 129 (1942). 



511 Metabolite of Hydnum aurantiarum, C^<iii^^)OlQ, colorless needles. 



m.p. 305-307°. 



(y^--" <r^o°" 



° i=o 



Hydnum aurantiacinn Batsch. 



Aurantiacin and thelephoric acid are produced by the 

 same organism. 



Jarl Gripenberg, Acta Chem. Scand. 12 1411 (1958). 

 Coenzymes Q (Mitoquinone, Ubiquinone, Qot.-,. SA). 



These compounds occur widely in the cell mitochondria 

 of microorganisms and higher animals, where they play a 

 part in the electron transport system. Variations in side- 

 chain length occur as in the case of vitamin K. Com- 

 pounds in which n = 6, 7, 8 and 9 have been isolated from 

 microbial sources. The quinone moiety resembles auran- 

 tiogliocladin. 



