S -(4 -Ethylamino -6 -isopropylamino -2-5triazino)glutathione and 7-L-glutamyl-S-(4-ethvlamino -6 -isopropylamino -2 -striazino) -lcysteine were isolated from atrazine treated sorghum leaf sections by ion-exchange chromatography and identified by a combination of spectroscopic, chemical, and chromatographic procedures. These compounds represent a new class of herbicide metabolites in plants and demonstrate the existence of a new pathway for the metabolism of atrazine.

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tion. Further investigation of the dealkylation products, namely the chlorinated and hydroxylated 4,6-diamino-striazines, was hindered by extraction and partition difficulties but is in progress.

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