Crystalline polymorph forms of 3-[2-butyl-1-(2-diethylamino-ethyl)-1H-benzoimidazol-5-yl]-N-hydroxy-acrylamide are described. Pharmaceutical compositions and the uses of such compounds, compound forms, and compositions for the treatment of diseases and conditions are also presented.本發明描述3-[2-丁基-1-(2-二乙基胺基-乙基)-1H-苯并咪唑-5-基]-N-羥基-丙烯醯胺之結晶多晶型。本發明亦提供醫藥組合物及此等化合物、化合物形式及組合物用於治療疾病及病狀之用途。