9 o THE CHEMICAL CONSTITUTION OF THE PROTEINS 



COOC 2 H 6 COOC 2 H 6 COOC a H 6 



Na | (CH 3 ) 2 .CH.CH 2 Br | Br 

 CH 2 > CHNa > CH . CH 2 , CH . (CH s ) a > 



COOC 2 H 6 COOC 2 H B COOC 2 H 5 



COOC 2 H 5 COOH 



H 2 | -C0 2 

 C(Br).CH 2 .CH.(CH 8 ) 2 > C(Br) . CH 2 . CH . (CH 8 ) 2 > 



COOC 2 H 5 COOH 



H H 



I NH 3 | 



C(Dr) . CH 2 . CH(CH 3 ) a > C(NH 2 ) . CH 2 . CH(CH 3 ) 2 



COOH COOH 



