Disclosed are aspartic protease inhibitors represented by the following structural formula: and pharmaceutically acceptable salts thereof. These compounds are orally active and bind to aspartic proteases to inhibit their activity. They are useful in the treatment or amelioration of diseases associated with aspartic protease activity. The present invention is also directed to pharmaceutical compositions comprising a compound described herein or enantiomers, diastereomers, or salts thereof and a pharmaceutically acceptable carrier or excipient.