This invention pertains to a crystalline compound of Formula (A) as described herein and compositions containing this crystalline compound, as well as methods of using the compound or pharmaceutical compositions comprising it to treat bacterial infections. The compound and compositions are especially useful to treat Gram negative bacterial infections, including mult-drug resistant strains.本發明係關於如本文所述之式(A)結晶化合物及包含該結晶化合物之組合物、及使用該化合物或包含其之醫藥組合物以治療細菌感染之方法。該化合物及組合物尤其可用於治療革蘭氏陰性細菌感染,包括多重抗藥性菌株感染。
