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.在一態樣中,本發明係關於具有以下結構之化合物:或其醫藥上可接受之鹽,及此化合物之結晶型,其具有腎胰島素殘基溶酶(neprilysin)抑制活性。在另一態樣中,本發明係關於包括此化合物之醫藥組合物、使用此化合物之方法及製備此化合物之方法。