| abstract |
[Problem] The main object of the present invention is to provide a novel 2- {4- [N- (5,6-diphenylpyrin-2-yl) -N-isopropylamino] butyloxy} -N- (methylsulfonyl) crystal acetamide (hereinafter referred to as "compound A"). [Means for resolution] A Form I-crystal of compound A, which exhibits diffraction peaks at 9.4 degrees, 9.8 degrees, 17.2 degrees, and 19.4 degrees in the powder X-ray diffraction spectrum. A Form-II crystal of compound A, which exhibits diffraction peaks at 9.0 degrees, 12.9 degrees, 20.7 degrees, and 22.6 degrees in the powder X-ray diffraction spectrum. A Form-III crystal of compound A, showing diffraction peaks at 9.3 degrees, 9.7 degrees, 16.8 degrees, 20.6 degrees, and 23.5 degrees in the powder X-ray diffraction spectrum. |