Describe is a crystalline form of (1 R,2R)-7-chloro-3-[2-(2,4-difluorophenyl)-2-hydroxy-1-methyl-3-(1H-1,2,4-triazol-1-yl)propyl]quina-zolin-4(3H)-one that is Form III and that is suitable for use in treating and/or preventing a microbial or fungal infection, and/or Chagas disease, in a mammal. Further described are pharmaceutical compositions comprising an effective amount of the crystalline form and a pharmaceutical-ly acceptable carrier(1R,2R)-7-氯-3-[2-(2,4-二氟苯基)-2-羥基-1-甲基-3-(1H-1,2,4-三唑-1-基)丙基]喹唑啉-4(3H)-酮的新穎結晶型式,包含這些結晶型式的藥劑組成物,使用這些結晶型式作為治療和/或預防各種微生物和/或黴菌感染或疾病的方法,以及得到這些結晶型式的程序。特別是,本發明係有關於(1R,2R)-7-氯-3-[2-(2,4-二氟苯基)-2-羥基-1-甲基-3-(1H-1,2,4-三唑-1-基)丙基]喹唑啉-4(3H)-酮的特殊結晶體結構I、II、III、IV、V、和VI。