The inhibitory activities (pI50 values) of a series of 3-alkylamino-2-cyanoacrylic acid ester derivatives in relation to photosypthetic electron transport in isolated pea chloroplast suspensions are reported. Assuming such pI50 values reflect the relative binding affinities for the inhibitor receptor site, the results suggest that several groups in these molecules interact specifically with the binding domain so that a multi-point attachment is formed. Stereochemical factors appear to play a significant role in the interaction.
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