62 THE CHEMICAL CONSTITUTION OF THE PROTEINS 



methyl dichlorodiacetiraide, prepared from chloropropionitrile and 

 chloracetic acid. 



Neither diglycinimide nor benzoyldiglycinimide were hydrolysed 

 by pepsin or by trypsin. 



Iminodiacetic acid and triglycolamic acid have been shown by 

 Siegfried to be formed in the oxidation of glycine by mercuric chloride 

 at 3 7C.:- 



Q^H, . NH,v CH, NH-CH, 

 ) + NH, 



OOH / COOH COOH 



Q^H,.NH,\ CH, N CH, 

 OOH / COOH CH, COOH + 2 NH, 



COOH 



