During the past century a number of physiological and chemical studies have been carried out to elucidate the mechanism of phototropic curvature. Recently, we
have isolated auxin-inhibitory benzoxazolinones from light-grown maize shoots as potent anti-auxins,and we reported the structure-activity relationships of benzoxazolinones with respect to auxin-induced growth and membrane-bound auxinbinding protein(s).The precise mechanism by which cell elongation is evoked by 
auxin remains unknown,although presumably it involves a complex of auxin and auxin receptor(s).The identity of the auxin receptor that mediated cell elongation is also unknown. Recently, indirect methods have been used to identify an auxinbinding protein (ABP) which has some of the expected characteristics of the receptor  that mediated cell elongation.Photoaffinity labeling has been successful in identify and characterizing receptors from animal and plants.In this communication we wish  to report the results of studies on the synthesis of two photolabile benzoxazolinones analogues with a trifluoromethyldiazirine group which has been proved to be a useful photoaffinity probe for direct labeling of indole-3-acetic acid (IAA)receptor(s)or IAA binding proteins in maize.

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