Method for producing high melting point crystals of phenoxypropionic acid derivative
   
   

A method for producing crystals of ethyl (R)-2-[4-(6-chloro-2-quinoxalin-2-yloxy)phenoxy]propionate, which is characterized by heating crystals, or crystals and crystals, within a range of from 50 C. to lower than the melting point of the crystals.

 
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