Spirazines 



13 



Monobasic diamino acids: 

 Ornitliine 



Arginine 



Lysine 



NH, CO— OH 



\ / 



CH2— CH2— CHo— CH 



\ 

 NH2 



NH 



\— NH CO— OH 



/ \ / 



NH2 CH2— CH,— CH2— CH 



NH2 



NH, CO— OH 



\ / 



CH.— CH,— CH2— CH2— CH 



\ 



NH2 



Hydroxy- and Thio-amino acids: 

 Serine 



Hydroxyglutamic acid 



Cysteine 



CO— OH 



/ 



HOCH2— CH 



\ 



■ NH, 



H CO— OH 



O / 



CH.— CH— CH 



/ \ 



HO— OC NH, 



CO— OH 



/ 



HS— CH,— CH 



\ 



NH, 



Cystine 



NH. 



CO— OH 



\ / 



HC— CH,— S— S— CH2— CH 



/ \ 



HO— OC NH, 



