The present invention provides a tetomilast crystal that is industrially easily produced in a large volume. (1) a tetomilast hydrate crystal having a powder X-ray diffraction spectrum that is substantially the same as the powder X-ray diffraction spectrum shown in FIG. 2; (2) an anhydrous tetomilast type A crystal having a powder X-ray diffraction spectrum that is substantially the same as the powder X-ray diffraction spectrum shown in FIG. 4; (3) an anhydrous tetomilast type C crystal having a powder X-ray diffraction spectrum that is substantially the same as the powder X-ray diffraction spectrum shown in FIG. 8; (4) a tetomilast acetonitrile solvate crystal having a powder X-ray diffraction spectrum that is substantially the same as the powder X-ray diffraction spectrum shown in FIG. 10; and (5) a mixture consisting of the above anhydrous tetomilast type A crystal and an anhydrous tetomilast type B crystal. These crystals are stable towards heat and moisture, and are also excellent in terms of the disintegration property and dissolution property of tablets. Accordingly, these crystals are preferably used as pharmaceutical compositions.
本发明提供了一种工业化易于大规模生产的Tetomilast晶体。(1)一种Tetomilast
水合物晶体,其具有与图2所示的粉末X射线衍射谱基本相同的粉末X射线衍射谱; (2)一种无
水Tetomilast A型晶体,其具有与图4所示的粉末X射线衍射谱基本相同的粉末X射线衍射谱; (3)一种无
水Tetomilast C型晶体,其具有与图8所示的粉末X射线衍射谱基本相同的粉末X射线衍射谱; (4)一种Tetomilast
乙腈溶剂晶体,其具有与图10所示的粉末X射线衍射谱基本相同的粉末X射线衍射谱;以及(5)由上述无
水Tetomilast A型晶体和无
水Tetomilast B型晶体混合而成的混合物。这些晶体对热和湿度稳定,并且在片剂的分散性和溶解性方面也非常优秀。因此,这些晶体最好用作药物组合物。