PRODUCTS OF DECOMPOSITION 



8. Serin: C 3 H 7 NO 3 , or /S-hydroxy-a-aminopropionic acid: 



CH 2 (OH).CH(NH 2 )COOH. 



9. Cystin: C 6 Hi2N2O4S 2 or dicystein, or di-(/3-thio-a-aminopropionic 



acid) : 

 HOOC.CH(NH 2 ).CH 2 .S - S.CH 2 .CH(NH 2 ).COOH 



B. Monoaminodicarboxylic Acids 



10. Aspartic acid, C 4 H 7 NO 4 , or aminosuccinic acid. 

 HOOC.CH 2 .CH(NH 2 ).COOH. 



11. Glutamic acid, CsHgNO^ or a-aminoglutaric acid: 



HOOC.CH 2 .CH 2 .CH(NH 2 )COOH. 



C. Diaminomonocarboxylic Acids 



12. Arginin, C 6 Hi 4 N 4 O 2 , or a-amino-5-guanidinvalerianic acid: 



/NH 2 

 HN = C( 



x NH.CH 2 .CH 2 .CH 2 .CH(NH 2 )COOH. 



13. Lysin: CeHi 4 N 2 O 2 or a-e-diaminocaproic acid: 



H 2 N.CH 2 .CH 2 .CH 2 .CH 2 .CH(NH 2 ).COOH. 



D. Diamino-oxy-monocarboxylic Acids 



14. Caseinic acid, or diaminotrioxydodecanic acid: 



C 12 H 26 N 2 5 . 



E. Heterocyclic Compounds 



15. Histidin, C 6 H 9 N 3 O 2 , or /3-iminazolyl-a-aminopropionic acid: 



CH 



# \ 

 N NH 



I I 

 CH = C.CH 2 .CH(NH 2 ).COOH 



16. Prolin, C 5 H 9 NO 2 , or a-pyrrolidin carboxylic acid: 



I I 



CH 2 CH.COOH 

 VH 



17. Oxyprolin, or oxypyrrolidin carboxylic acid: 



C 6 H 9 N0 3 . 



18. Tryptophane, CnHi 2 N 2 O 2 , or /3-indole-a-aminopropionic acid: 



C.CH 2 .CH.NH 2 .COOH 



/ ^ 



C 6 H 4 CH 



VH 



