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1. 25-3H- and 26-14C-labelled (24S)-24-ethylcholest-5-en-3beta-ol (clionasterol) were synthesized from (24S)-24-ethylcholesta-5,25-dien-3beta-ol. 2. These labelled substrates were mixed and administered, together with the hypocholesterolemic agent, triparanol citrate, to Tenebrio molitor larvae. 3. The 3H label from the clionasterol substrate was retained in both the desmosterol and the cholesterol isolated from the larvae. 4. Location of this 3H label in the desmosterol showed that dealkylation of the clionasterol involved 3H migration from C-25 to C-24. A possible mechanism for dealkylation is presented.

Mechanism of dealkylation of clionasterol in the insect Tenebrio molitor