9. 



Tryptophp.n 3 



H COOK 



- C :.,^ ' 



HC ^ '^- Q- -• C~CHp — OK 



ii i if "^ 



HC /-C . CH 



H i]H 



t 



Leucin3-gluta,!i]ic «.cid .anhydrida 

 (p. A. L?vin3 & W.A. Beatty, 

 Ber. 59, 2060, 1906.) 



^, CO — ITIi^ ^ CK3 



HOOC-CHp-CK^-CH'" ^Z. CH-CHp-CH ^ 



^ ^ -^ i:tT CO -^ ^ -^ CH3 



Valyiz-leucine 



(?:. Abderlial den, Z. Physiol. Oh 3m., 



131, 284, 1923.) 



CH^ .CO — :iH .^ ^. CH3 



^^ CH- CK : '^ CH- CHg - CH '" 



CH3 "" ""■mi — CO -^'^ ^^^^ CH3 



Leucine anh^.^dride 



(E. Aoderhalden & K Punk, 



Z. physioi. Che-T,. 53, 19, 1917.) 



CH^ CO — KH^ ,,.CH3 



'"'^ CH- CHp - CH '^' ^ CH- CHo - CH " 



CH^-^' ^ irn — CO "" ^ "^"CiHj 



