PROBLEM TO BE SOLVED: To provide a crystal of 2-[[[3-methyl-4-(2,2,2-trifluoroethoxy)-2-pyridinyl] methyl] sulfinyl]-1H-benzimidazole compounds having high stability and solubility.SOLUTION: A crystal of (R)-2-[[[3-methyl-4-(2,2,2-trifluoroethoxy)-2-pyridinyl] methyl] sulfinyl]-1H-benzimidazole has a powder X-ray diffraction pattern showing characteristic peaks at lattice spacing (d) of the powder X-ray diffraction of 10.06±0.2, 8.70±0.2, 6.57±0.2, 5.59±0.2 and 4.00±0.2 Angstrom. The crystal can be an antiulcer drug which is stable and superior in absorbency.【課題】安定性・溶解度が高い２－［［［３－メチル－４－（２，２，２－トリフルオロエトキシ）－２－ピリジニル］メチル］スルフィニル］－１Ｈ－ベンズイミダゾール化合物の結晶の提供。【解決手段】粉末Ｘ線回折の格子面間隔（ｄ）が１０．０６±０．２，８．７０±０．２，６．５７±０．２，５．５９±０．２，４．００±０．２オングストロームに特徴的ピークが現れる粉末Ｘ線回折パターンを有する（Ｒ）－２－［［［３－メチル－４－（２，２，２－トリフルオロエトキシ）－２－ピリジニル］メチル］スルフィニル］－１Ｈ－ベンズイミダゾールの結晶。該結晶は、安定で吸収性に優れた抗潰瘍剤となりうる。【選択図】なし
