168 CHEMISTRY OF PLANT LIFE 



These amino-acids, grouped according to the characteristic 

 groups which they contain, are as follows: 



A. Monoamino-monocarboxylic acids: 



Glycine, C 2 HsNO 2 , CH2NH2-COOH, ammo-acetic acid. 

 Alanine, C 3 H 7 N0 2 , CH 3 -CHNH 2 -COOH, amino-propionic 



acid. 



Serine, C 3 H 7 N0 3 , CH 2 OH CHNH 2 COOH, oxy-amino-pro- 

 pionic acid. 



Valine, C 5 HnNO 2 , >CH CHNH 2 COOH, amino-iso- 



CH-/ 

 valerianic acid. 



CHs x 

 Leucine, C 6 Hi 3 N0 2 , >CH CH 2 CHNH 2 COOH, 



CH-/ 

 amino-isocaproic acid. 



CH 3x 

 Isoleucine, C 6 Hi 3 NO 2 , >CH CHNH 2 COOH, 



amino-methylethyl-propionic acid. 



Phenylalanine, C 9 HnNO 2 , f /N ^,CH 2 CHNH 2 COOH, 



phenyl-amino-pro- 

 pionic acid. 



Tyrosine, C 9 HnNO 3 , ( N ]CH 2 -CHNH 2 -COOH, paraoxy- 



phenylalanine. 

 OHl ' 



Cystine, C 6 Hi 2 N 2 O4S 2 , HOOC CHNH 2 - CH 2 S SH 2 C 

 CHNH 2 -COOH, di(thio-amino-propionic acid). 



B. Monoamino-dicarboxylic acids: 



Aspartic acid, C 4 H 7 N0 4 , HOOC CH 2 CHNH 2 COOH, 



amino-succinic acid. 

 Glutamic acid, C 5 H 9 N0 4 , HOOC CH 2 CH 2 CHNH 2 



COOH, amino-glutaric acid. 



