Polymorphs of 19-Nor steroid derivatives

摘要

Crystalline polymorphic Forms A or B of 11²-[4-[5-[(4,4,5,5,5-pentafluoropentyl)sulfonyl]pentyloxy] phenyl]-estra-1,3,5(10)-triene-3,17²-diol, their preparation, use and the pharmaceutical compositions comprising Form B.