described 5 - fluorine -., - dihydroxy - 17.beta. 5.alfa. - androstan - 6 - he formula iv is also described the synthesis of 5 - fluorine -., 17.beta. -dihydroxy-5.alfa.- androstan - 6 - the formula iv, which is a partial hydrolysis of 5 - fluorine - 6 - oxo - 5.alfa. - androstan -. beta. - amino acetate, 17.beta. the alkaline cinidlem 5 - fluorine -. beta. -hydroxy-6-oxo-5.alfa.- androstan - 17.beta. - yl acetate, which solvolytickou relief configuration at the position 3 provides 5 - fluorine -. - hydroxy -, 6 -, oxo - 5.alfa. -androstan-17.beta.- yl acetate and the hydrolyticku00fdm odstranenu00edm defending groups provide desired 5 - fluorine -., - dihydroxy - 17.beta. 5.alfa. - androstan - 6 - he formula iv. furthermore, the invention relates to the use of 5 - fluorine -., 17beta. - dihydroxy - 5.alfa. - androstan - 6 - the formula iv for the regulation of plant growth and increase yield for both plants and odstranovu00e1nu00ed stress pusobu00edcu00edch on plants.
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