Abstract
The biotransformation of 3β-hydroxy-5β-methyl-19-norpregn-9-en-20-one and the corresponding 3,20-dione by Cephalosporium aphidicola has been shown to give 10β-hydroxy-5β-methyl-19-norpregn-9(11)-ene-3,20-dione and related products.
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