CHEMICAL STRUCTURE 



clues have been provided for the first time to suggest a rational 

 approach to the biosynthesis of ergosterol and the plant sterols. 

 There is little doubt that the organic chemist will continue to 

 chance upon compounds which will aid in the further elucidation 

 of biogenetic pathways. Conversely, the elaboration of bio- 

 synthetic mechanisms will provide the background for predicting 

 the existence of novel chemical structures, and thereby serve to 

 intensify the exploration of natural sources. Though the chem- 

 ist's principal task will continue to be to determine structures 

 and the biochemist's to find out how they are made, their 

 eff^orts tend increasingly toward the same goal and hence they 

 are bound to benefit by a more intimate acquaintance with 

 their mutual problems. 



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