Patent ID: 9643994
Date: 2017-05-09
CPC Classifications: A61P,C07B,C07J

Claim:
1. A crystalline polymorphic form B of ulipristal acetate having an X-ray powder diffraction pattern comprising diffraction peaks at the following diffraction 2theta angles: 6.4±0.2°, 8.4±0.2°, 9.4±0.2°, 9.6±0.2°, 11.8±0.2°, 12.8±0.2°, 15.3±0.2°, 16.7±0.2°, 17.5±0.2°, 18.6±0.2°, 19.3±0.2°, 21.0±0.2°, and 25.5±0.2°; wherein the crystalline polymorphic form C of ulipristal acetate has a differential scanning calorimetry spectrum exhibiting an endothermic peak at about 160 to 170° C.