The present invention provides a stable crystal of 3-ethyl-4 - {3-isopropyl-4 - (4 - (1-methyl-1h-pyrazole-4-yl) - 1h-imidazolo [3,4-b] pyridine-1-yl} benzamide with excellent oral absorption.The 3-ethyl-4 - {3-isopropyl-4 - (4 - (1-methyl-1h-pyrazol-4-yl) - 1h-imidazolo-1-yl) - 1H-pyrazolo [3, A type II crystal of 4-b] pyridine-1-yl} benzamide, characterized in that it has at least three characteristic peaks selected from the diffraction angles (2 θ ± 0.2 °) 7.7 °, 8.0 °, 11.1 °, 12.5 °, 12.9 °, 15.2 °, 15.8 °, 17.2 °, 19.0 °, 22.5 °, 26.1 ° and 27.4 ° in the powder X-ray diffraction pattern.本發明提供一種3-乙基-4-{3-異丙基-4-(4-(1-甲基-1H-吡唑-4-基)-1H-咪唑-1-基)-1H-吡唑并[3,4-b]吡啶-1-基}苯甲酰胺的穩定且口服吸收性優異的結晶。本發明的3-乙基-4-{3-異丙基-4-(4-(1-甲基-1H-吡唑-4-基)-1H-咪唑-1-基)-1H-吡唑并[3,4-b]吡啶-1-基}苯甲酰胺的II型結晶，其特徵在於，在粉末X射線衍射圖譜中具有選自衍射角(2θ±0.2°)7.7°、8.0°、11.1°、12.5°、12.9°、15.2°、15.8°、17.2°、19.0°、22.5°、26.1°和27.4°中的至少3個以上的特徵峰。
