The invention relates to crystalline forms of (R)-5-[3-chloro-4-(2,3-dihydroxy-propoxy)-benz[Z]ylidene]-2-([Z]-propylimino)-3-o-tolyl-thiazolidin-4-one, processes for the preparation thereof, pharmaceutical compositions containing said crystalline forms, and their use as compounds improving vascular function and as immunomodulating agents, either alone or in combination with other active compounds or therapies.本發明係關於一種(R)-5-[3-氯-4-(2,3-二羥基-丙氧基)-苯并[Z]亞基]-2-([Z]-丙基亞胺基)-3-鄰甲苯基-噻唑烷-4-酮之晶形、其製備方法、包含該等晶形之醫藥組合物、及其單獨或與其他活性化合物或治療法組合，作為改良血管功能之化合物及作為免疫調節劑之用途。
