Polymorphs of N-methyl-N-(3-{3-[2-thienylcarbonyl]-pyrazol-[1,5-&agr;]-pyrimidin-7-yl}phenyl)acetamide (Compound 1), and use of the same as a sedative-hypnotic, anxiolytic, anticonvulsant, and skeletal muscle relaxant agent. Processes for making the same, as well as related compositions and methods are also disclosed, particularly with regard to treatment of insomnia. A polymorph Form I possessing exception physical and heat stability is provided. A polymorph Form II
N-甲基-N-(3-3-[2-
噻吩甲酰]-
吡唑-[1,5-α]-
嘧啶-7-基}苯基)乙酰胺(化合物1)的多态形式,以及将其用作镇静催眠剂、抗焦虑剂、抗抽搐剂和骨骼肌松弛剂的用途。还公开了制备该化合物的方法,以及相关的组合物和方法,特别是关于治疗失眠的方法。提供了具有特殊物理和热稳定性的多态形式I。多态形式II。