The novel methanol solvate, ethanol solvate, ethanol·hydrate and isopropanol·hydrate crystals of (R)-2-[[[3-methyl-4-(2,2,2-trifluoroethoxy)-2-pyridinyl]methyl]sulfinyl]-1H-benzimidazole; pharmaceutical agents which comprise these crystals; and their use for the prophylaxis or treatment of digestive ulcer.