A novel form of ulipristal acetate useful as an agent for preventing and/or treating uterine leiomyoma and as a contraceptive, and a process for producing the ulipristal acetate are provided. An amorphous ulipristal acetate or a novel ulipristal acetate substance containing an amorphous ulipristal acetate is obtained by dissolving a raw ulipristal acetate in a halogenated hydrocarbon and condensing the solution. The amorphous ulipristal acetate may have an exothermic peak at about 135 to 145℃ in a differential scanning calorimetry spectrum.本發明提供可用作用於預防及/或治療子宮平滑肌瘤之藥劑及用作避孕劑之烏普司他醋酸(ulipristal acetate)之新穎形式及產生該烏普司他醋酸的方法。藉由將原始烏普司他醋酸溶於鹵代烴中且濃縮溶液來獲得非晶形烏普司他醋酸或含有非晶形烏普司他醋酸之新穎烏普司他醋酸物質。該非晶形烏普司他醋酸在差示掃描熱量測定光譜中於約135℃至145℃下可具有放熱峰。
