NOVEL STABLE CRYSTAL FORM OF N-TRANS-4-ISOPROPYLCYCLOHEXYL CARBONYL)-D-PHENYLALANINE AND PROCESS OF PREPARATION

摘要

This invention relates to novel stable crystal form of N-(trans-4-isopropylcyclohexylcarbonyl)-D-phenylalanine may be produced by crystallisation of N-(trans-4-isopropylcyclohexylcarbonyl)-D-phenylalanine with a solvent at 25 - 38 DEG C and forming crystals in the solvent. The crystal form may be formed by recrystallisation out of solution. The Crystal form obtained in this way have different melting point, infra red spectrum and X-ray diffraction patterns from previously known forms "B-type" and "H-Type" of the compound.