The present invention relates to a crystalline form of the compound (S)-3-{4-[5-(2-cyclopentyl-6-methoxy-pyridin-4-yl)-[1,2,4]oxadiazol-3-yl]-2-ethyl-6-methyl-phenoxy}-propane-1,2-diol.本發明係關於化合物(S)-3-{4-[5-(2-環戊基-6-甲氧基-吡啶-4-基)-[1,2,4]噁二唑-3-基]-2-乙基-6-甲基-苯氧基}-丙烷-1,2-二醇之結晶形式。