The present invention provides stable crystalline polymorphic Form C and Form D of (E)-Entacapone, (E)-N,N-diethyl-2-cyano-3-(3,4-dihydroxy-5-henyl)acrylamide and processes for their preparation. The polymorphic Form C and Form D of (E)-Entacapone are characterized by specific Infra Red (IR) and X-ray powder diffraction peak values.
本发明提供了(E)-
恩他卡朋的稳定结晶多形体C和多形体D,以及它们的制备方法。 (E)-
恩他卡朋的多形体C和多形体D具有特定的红外(IR)和X射线粉末衍射峰值。