,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 H 5 NO2, CH 2 NH 2 -COOH, amino-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. 



K 

 Valine, C 5 HnN0 2 , >CH - CHNH 2 - COOH, amino-iso- 



CH-/ 

 valerianic acid. 



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 N0 2 , >CH - CHNH 2 - COOH, 



C 2 H 5 / 

 amino-methylethyl-propionic acid. 



Phenylalanine, C 9 HnNO 2 , (" X |CH 2 CHNH 2 COOH, 



Uphenyl-amino-pro- 

 pionic acid. 



Tyrosine, C 9 HnNO 3 , /Nc^-CHNH^COOH, paraoxy- 



phenylalanine. 



OH V 



Cystine, C 6 Hi 2 N 2 O 4 S 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 NO 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. 



