186 PROTEINS AND CARBOHYDRATES 
II. Dicarboxylic acids. 
Aspartic acids, a-amino succinic acid. 
H 
| O 
NHs—C—C“ 08 
H—-C—0Z0H 
| 
H 
Glutamic acid, a-amino, n-glutaric acid. 
NHe 
III. Diamino acids. 
Lysine, e-e-diamino caproic acids. 
NHe H H H NHge 
Arginine, d-guanidine, amino valerianic acid. 
H H NHe 
IV. Heterocyclic amino acids. 
Tryptophane, B-indole, a-amino propionic acid. 
H H 
O 
0-00-00 
| H bet, 
wa \a 
| 
H 
