122 THE CHEMICAL CONSTITUTION OF THE PROTEINS 



COOH 



C 6 H 5 . CO NH . CH 2 . CH 2 . CH 2 . CH . NH CO . C 6 H 5 



/ornithuric acid\ 

 / COOH \ COOH 



/I ^ I 



C 6 H 5 . CO NH . CH 2 . CH 2 . CH 2 . CH . NH 2 H 2 N . CH 2 . CH 2 . CH 2 . CH. NH OC . C 6 H 5 



5-benzoylornithine o-benzoylornithine 



COOH NH HN COOH 



\ I II II * 1 



C 6 H 6 . CO NH . CH 2 . CH 2 . CH 2 . CH . NH C NH 2 H 2 N C HN . CH 2 . CH 2 . CH 2 . CH . NH 



OC C 6 H 5 

 5-benzoylamino-o-guanidovalerianic acid a-benzoylamino-5-guanidovalerianic acid 



COOH NH HN 



* I Hi 



H 2 N . CH 2 . CH 2 . CH 2 . CH . NH C NH 2 H 2 N C HN . CH 2 . CH 2 . CH 2 . CH . 



5-amino-o-guanidovalerianic acid a-amino-5-guanidovalerianic acid 



arginine. 



The resulting a-amino-8-guanidovalerianic acid was found to be identi- 

 cal with racemic arginine. 



COOH 

 NH 2 



