BIOCHEMICAL ANTAGONISM 



Compounds of General Type I 



NH, 



COOH 



p-Aminobenzoic 

 acid 



Class B 



NH, 



I 



c=o 



I 

 CH3 



Aminoacetophenone 



/\- 



-COOH 



Nicorinic acid 



/\ 



o 



— C— CH, 



\N/ 



3-Acetylpyridine 



CH2OH 



I 



CH3 — C — CH I 

 CHOH 



c=o 



I 

 NH 



I 

 CH, 



I 

 CH, 



COOH 



Pantodienic acid 



CH2OH 



I 



CH 3 — C — CH , 



I 

 CHOH 



1 



c=o 



I 



NH 



I 

 CH, 



I 

 CH, 



I 



c=o 



I 



CjHj 



Phenylpantothenone 



371 



