Plant Qrowth'Suhstances 

 Typical Formulae contd. 



/\ 



CHvCOOH 



N 



Indole-acetic acid; 

 S-indolylacetic acid. 



CH 



COOH 



N 



2-car'boxy-skatole ; 

 2-carboxy-3-methyl-indole. 



CHgfCOOH 



Acenaphthyl-5-acetic acid. 



CHj'COOH 



A nthraceneacetic acid. 



/X 



CH3 

 CH-COOH 



N 



(S-indolyl)-a-propionic acid. 

 [Presumed configuration of EI- 

 linger's {1905) indole-meihylacetic 

 acid] 



CHj-CN 



a-naphthylacetonitrile. 



102 



