The present invention provides novel polymorphs of (3S,11aR)-N-[(2,4-difluorophenyl) methyl]-6- hydroxy-3-methyl-5, 7-dioxo-2, 3,5,7, 11, 11a-hexahydro[1, 3]oxazolo[3, 2-a]pyrido[1, 2-d]pyrazine-8-carboxamide including sodium and potassium salts and pharmaceutical compositions containing these polymorphs. Also provided are methods for making the novel polymorphs.
本发明提供了(3S,11aR)-N-[(2,4-二
氟苯基)甲基]-6-羟基-3-甲基-5,7-二氧代-2,3,5,7,11,11a-六氢[1,3]
噁唑并[3,2-a]
吡啶[1,2-d]
吡嗪-8-羧酰胺的新型多晶形态,包括钠盐和
钾盐,以及含有这些多晶形态的制药组合物。还提供了制备新型多晶形态的方法。