The present invention provides a crystal of a 1.5 D-tartrale of a compound represented by the formula (1) having an A production inhibitory effect, characterized in that the crystal has a diffraction peak at a diffraction angle (2 0.2 ) of 23.2 in powder X-ray diffractometry a crystal of a disulfate of the compound of the formula (1), characterized in that the crystal has a diffraction peak at a diffraction angle (2 0.2 ) of 17.1 in powder X-ray diffractometry various other salts of the compound of the formula (1) crystal polymorphs of these salts and the like, which are expected to be used as drug substances.
