( 44 ) 



CH3CH(NH)C00CH, 



CO 

 when oxalyldi{«.aminopropionic methjlester) | 



CO 



I 

 CH3CH(NH)C00CH, 



was obtained in delicate white needles. Further that of diglycylglycin- 



ethylester when oxalyldi(diglycylglycinethy tester) 



CO NH CH,CO NH CH,CO NH ClI,COOC,H, 



CO NH CH.CO NH CH.CO NH CHXOOC.H^ 

 was formed as silky delicate needles with a melting or decomposition 

 point at 302°. They give a red violet biuret reaction. 



An example was also taken from the aminoderivatives of the 

 dibasic acids, namely the hydrochloride of the diethylester of glutaminic 

 acid which yielded oxalyldi(glutaminic diethylester) 



* CH CH,CH,C00C',H3 



CONHCOOC.Hj 



CO NH COOC^Hj 



^CH CH,CHX00C,H5 

 as exceedingly fine hair-like crystals m. p. 94°.5. 



The compounds ol)tained might probably become of interest as 

 regards the knowledge of the albumenoids. It is known that more 

 than forty years ago Schützfaberger obtained oxalic acid from all 

 albumenoids by resolving these with bariun» hydroxide. For instance 

 from : 



Egg albumen 5,7 7o barium oxalate r= 2,22 "/« oxalic acid 



12,5 „ 4,87 



Caseïn ' 17,5 ,, 6,82 



Serum (from horse's blood) 16,5 ,, 6,43 



Fibrin (from horse's blood) 11,5 ,, 4,48 



5,73 

 3,12 

 1,95 

 8,14 

 7,74 

 4,50 

 ,, 6, 26 



4 44 

 3,55 



