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The last enzyme in the biosynthetic pathway to juvenile hormone III in the corpora allata of hemimetabolous insects is methyl farnesoate epoxidase, a cytochrome P450 monooxygenase. Assays with intact glands incubated in vitro and with gland homogenates have identified a series of 1,5-disubstituted imidazoles as potent inhibitors of the enzyme. We have designed, synthesized and tested two imidazoles,...