PROBLEM TO BE SOLVED: To provide a compound useful for the treatment of prostate cancer and having activity as androgen receptor (AR) antagonist, a pharmaceutical composition comprising the compound as an active ingredient, and method for producing the compound.SOLUTION: The present invention provides a compound represented by formula (I), and a pharmaceutical composition comprising the compound, and a method for producing the compound using Streptomyces sp BB47 strain.SELECTED DRAWING: Figure 7COPYRIGHT: (C)2017,JPO&INPIT【課題】前立腺癌の治療に有効な、アンドロゲン受容体(AR)アンタゴニストとしての活性を有する化合物、及び該化合物を有効成分として含有する医薬組成物、該化合物の製造方法の提供。【解決手段】式(I)で表される化合物、及び該化合物を含有する医薬組成物、及びストレプトマイセス・エスピーBB47株による該化合物の製造方法。【選択図】図7