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A microsomal cytochrome P450 from a cell line of the insect Chironomus tentans has been shown to hydroxylate the steroid hormone 20-hydroxyecdysone at C(26) to yield 20,26-dihydroxyecdysone, P1, which is further metabolized to P2 and P3. Based on 1 H NMR studies, acetonide formation and quantum chemical calculations, P2 and P3 represent novel slowly interconvertible geometrical isomers, occurring...