FIELD: pharmacology.
SUBSTANCE: invention relates to an inhibitor of 17α-hyroxilase-17,20-lyase (CYP17A1) activity, inhibiting the growth of prostate cancer cells, which is a derivative of pregn-17(20)-ene of the general formula 
(I), where R is 4',5'-dihydro-1',3'-oxazole-2'-yl- 
(Ia), or benzo-[d]-oxazole-2'-yl 
(Ib).
EFFECT: CYP17A1 activity inhibitor of general formula I can be used for prostate cancer treatment.
1 dwg, 4 ex
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