TIII: MI:T A HOLISM OF PROTKIX G05 



(-') The amino dibasic acids: 



Aspartic, which is aminosuccinic acid, 



CH 2 COOH 



I 



CHNH 2 COOH; and 



Glutaminie, which is aminoglutaric acid. 

 CH 2 



CH, - COOH 



I " 

 CHNH, COOH. 



Lastly there are the diamino acids, in which two groups exist: 



I,i(xitH' a e-diaminocaproie acid, 



NH 2 



NILCH, - GIL - GIL, - CH 2 - CH, - CH 



COOH. 

 Arginine a-amino 5-guanidine-valerianie acid, 



NH 2 



HNzizC NH 2 



NH.CH 2 - CH 2 - CH 2 - CH 



COOH 



The guanidine group in this acid is of interest because of its close relationship to 

 NH 2 



urea, which is O = C 



\ 

 NH 2 



