Glass 1,2-dihydropyridine compound and method for producing same

A crystal of 3- (2-cyanophenyl) -5- (2-pyridyl) -1-phenyl-1,2-dihydropyridin-2-one hydrate having a peak difraccionen a diffraction angle (2θ ± 0.2 °) of 8.7 ° in an X-ray diffraction powder.