In one aspect, the invention relates to a compound of the structure: or a pharmaceutically acceptable salt thereof, and a crystalline form of this compound, having neprilysin inhibition activity. In another aspect, the invention relates to pharmaceutical compositions comprising this compound; methods of using this compound; and processes for preparing this compound.在一個態樣中,本發明係關於一種如下結構之化合物:或其醫藥學上可接受之鹽及此化合物之結晶形式,其等具有奈溶酶(neprilysin)抑制活性。在另一態樣中,本發明係關於包含此化合物之醫藥組合物;此化合物之使用方法;及製備此化合物之方法。