Plant Qrowth'Suhstances 



H,C 



f^5(?)HC-HC 



ch-chC£7h 



\ 



CH 



C-CHOH-CHj-('CH0H),-C00H 



au.Tin-a 



HN- 



indole-3-acetic acid 



CH,-COOH 



HN- 



hUC-N 



HN:C 



creatinine 



--0H 



•CO 



•CH. 



HC 



\ 



COOH 

 C 



N= 



■CH 



^CH 



\ 



/ 



CH 



nicotinic acid; 

 pyridine-S-carboxylic acid 



H,N-C-N-CH2-COOH 

 ^ II I 

 HN CH. 



creatine 



88 



