2-Methylene-19-nor-20(S)-1alpha-hydroxy-bis-homo-pregnacalciferol in crystalline form

Abstract

A method of purifying 2-methylene-19-nor-20(S)-1α-hydroxy-bis-homo-pregnacaciferol to obtain 2-methylene-19-nor-20(S)-1α-hydroxy-bis-homo-pregnacalciferol in crystalline form. The method includes the steps of boiling a solvent such as acetone under inert atmosphere, dissolving a product containing 2-methylene-19-nor-20(S)-1α-hydroxy-bis-homo-pregnacalciferol to be purified in the solvent, cooling the solvent and dissolved product below ambient temperature for a sufficient amount of time to form a precipitate of 2-methylene-19-nor-20(S)-1α-hydroxy-bis-homo-pregnacalciferol crystals, and recovering the 2-methylene-19-nor-20(S)-1α-hydroxy-bis-homo-pregnacalciferol crystals.

Dependencies are inferred from the claim text.