FIELD: organic chemistry, chemical technology. SUBSTANCE: invention discloses method for preparing crystals exhibiting high melting point that involves heating ethyl-(R)-2- +AFs-4-(6-chloro-2-quinoxalyloxy)phenoxy+AF0-propionate as crystals of low melting point or crystals of low melting point and crystals of high melting point in the range from 50 C to temperature that is lower of melting point of crystals of low melting point. EFFECT: improved preparing method. 5 cl, 15 ex
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