469 Ergot Alkaloids 



(4) Robinson (1955):^ 



COOH 



I 



CH, 

 / COOH 



CH, I 



\ CH. 



COOH / 



NH— CHj CHj NH— CH3 



/ \ / 



CH— COOH C— CH 



\ II \ 



CH2 O CHj 



H H 



lysergic Acid 



(5) Feldstein (1956):« 



NH, 



"°°^-^( O NH, 



""CH, % / 



oi-Keto- 



a/ 



f^y^ ^Si/^N glutaric Acid 



H H 



COOH 



I 

 O CH, 



II / 

 HOOC— C— C NH, 



COOH 



I 



CH, 

 / 

 HOOC— C NH, 



% / CH2O 



^;?C__J> > Lysergic 



f fl -CO, 



^^=5iA-N-^ +CH, 



^ Sir Robert Robinson, "The Structural Relations of Natural Prod- 

 ucts," Oxford University Press, Oxford, 1955. 

 8 A. Feldstein, Experientia 12 475 (1956). 



