Providing crystals having good oral absorbency and obtainable with particularly good reproducibility. (R) -N- (1- (3- (cyclopentyloxy) phenyl) ethyl) -3-((2,4-dioxo-3,4-dihydropyrimidin-1 (2H) -yl) meth Crystal of methoxy) propane-1-sulfonamide.경구 흡수성이 양호하고, 특히 양호한 재현성으로 취득 가능한 결정의 제공.(R)-N-(1-(3-(시클로펜틸옥시)페닐)에틸)-3-((2,4-디옥소-3,4-디하이드로피리미딘-1(2H)-일)메톡시)프로판-1-술폰아미드의 결정.