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The metabolism of [1-3H]canrenone, a primary metabolite of spironolactone and potassium canrenoate, by rat liver preparations in vitro has been investigated. 2. Canrenone was metabolized by 3-oxo-delta 4-reduction to give 3 alpha-hydroxy-5 beta-spirolactones, and also by a number of O2 and NADPH-dependent microsomal hydroxylation reactions. 3. A major metabolic route requiring the presence of a microsomal fraction, but apparently independent of oxygen and NADPH, led to the formation of a number of compounds tentatively identified as trihydroxy-spirolactones.
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Boreham et al. (1981) studied this question.
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