Provided are a crystal of a hydrate of compound 1, showing diffraction peaks at diffraction angles (2θ±0.2°) of 10.7°, 10.9°, 14.4°, 19.1° and 22.8°, in powder X-ray diffraction, a crystal of compound 1 or hydrate thereof, showing diffraction peaks at diffraction angles (2θ±0.2°) of 7.2°, 8.9°, 13.2°, 16.4° and 22.4°, in powder X-ray diffraction, a crystal of an anhydride of compound 1, showing diffraction peaks at diffraction angles (2θ±0.2°) of 10.3°, 14.2°, 14.6°, 16.1° and 22.1°, in powder X-ray diffraction, and a crystal of compound 1 or hydrate thereof, showing diffraction peaks at diffraction angles (2θ±0.2°) of 7.3°, 10.7°, 16.3°, 19.8° and 23.8°, in powder X-ray diffraction.
