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process for the production of 21 phosphorsaeuremonoestern of 16alpha, 17alpha, 21 - trihydroxysteroid - 16 17 - acetalen and salts of these esters
process for the production of 21 phosphorsaeuremonoestern of 16alpha, 17alpha, 21 - trihydroxysteroid - 16 17 - acetalen and salts of these esters