223 Depsides and Depsidones 



467 Diffractaic Acid (Dirhizonic Acid), C00H00O7, colorless needles, 

 m.p. 189°. 



CH3O \ OCH3 i COOH 

 CH3 



Usnea diffracta Wain., Usnea longissima Ach., Alecto- 

 ria ochroleuca Mass. 



The yield was 3.6%. 



Yasuhiko Asahina and Fukuziro Fuzikawa, Ber. 65B 583 

 (1932). (Synthesis) 



468 Erythrin, CmuHooOj,, colorless needles, m.p. 148°, [ocW^ +10.63°. 

 ?"^ COO OH 



HO OH 1 COOCH2— CH— CH— CH2 



CHii I I I 



OH OH OH 



Roccella montagnei Bel. and R. fuciformis DC 

 This is an erythritol ester of lecanoric acid. The yield 

 was about 5% of the weight of the lichen. Free erythritol 

 and rocellic acid were isolated from the same source. 



Yosio Sakurai, 7. Pharni. Soc. Japan 61 108 (in German, 

 45) (1941). 



469 Divaricatic Acid, C21H04O7, colorless needles, m.p. 137°. 



CH3CH2H,C 



CH3O OH I COOH 



CH2CH2CH3 



Evernia divaricata L., E. mesomorpha f. esorediosa 

 Miill., Arg. 



The yield from E. mesomorpha was recorded as 2.5% 

 of the lichen weight. Usnic acid was isolated from the 

 same source. 



