86 ORGANIC AGRICULTURAL CHEMISTRY 



Leucine, a-amino-7-methyl-valeric acid (a-amino-iso-caproic 

 acid) : 



CHsv 



>CH - CH2 - CH(NH2) - COOH 



L3' 



CH3/ 



Iso-leucine, a-amino-jS-methyl- valeric acid : 



CH3 - CH2 - CH- CH(NH2) - COOH 



I 

 CH3 



Serine, a-amino-]8-hydroxy-propionic acid : 

 CHsCOH) - CH(NH2) - COOH 



Lysine, a-e-di-amino-caproic acid : 



CH2(NH2) - CH2 - CH2 - CH2 - CH(NH2) - COOH 

 Aspartic acid, amino-succinic acid : 



CH(NH2) - COOH 



CH2 - COOH 



Asparagine, mono-amide of amino-succinic acid: 

 CH(NH2) - COOH 



CH2 - CONH2 



This compound is both an amino-acid and an acid amide. 

 Glutamic acid, a-amino-glutaric acid : 



CH(NH2) - COOH 

 CH2 



CH2 - COOH 



Phenyl-alanine, «-amino-jS-phenyl-propionic acid : 

 CH2-CH(NH2)-COOH 



CeHs 



