To provide a novel crystal form of a compound represented by the following formula (I) which is excellent in stability and has a higher solubility than a known crystal form.SOLUTION: This invention relates to a process for preparing 3-(6-(1-(2,2-difluorobenzo [d] [1,3] dioxol-5-yl) cyclopropanecarboxamido)-3-methylpyridin-) Benzoic acid crystal form A and a process for producing the same. Such crystalline form A has low hygroscopicity, is easy to preserve, is excellent in stability, and has a higher solubility than a known crystalline form, so that it has great value in improvement and development of the drug in the future Is expected.Embedded image BACKGROUND OF THE INVENTION【課題】安定性に優れており、既知の結晶形態よりも溶解度が高い次の式(I)で示された化合物の新規結晶形態を提供する。【解決手段】本発明は、3-(6-(1-(2,2-ジフルオロベンゾ[d][1,3]ジオキソル-5-イル)シクロプロパンカルボキサミド)-3-メチルピリジン-2-イル)安息香酸の結晶形態A及びその製造方法を提供する。かかる結晶形態Aは、吸湿性が低く、保存しやすくて安定性に優れており、既知の結晶形態よりも溶解度が高いため、将来的には、当該薬物の改良及び開発において大きな価値を有することが予想される。【化1】【選択図】図1
