Collect. Czech. Chem. Commun. 1962, 27, 276-288

On steroids. LXV. Microbiological hydroxylation of 18-substituted steroids. Partial synthesis of 11β-hydroxy-3,20-dioxopregn-4-en-18-oic acid (18→11) lactone from (20R)-20-hydroxy-3-oxopregn-4-en-18-oic acid (18→20) lactone

L. Lábler and F. Šorm

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