申请人:THERAVANCE INC
                            
                            
                                公开号:WO2012082857A1
                            
                            
                                公开(公告)日:2012-06-21
                            
                            In one aspect, the invention relates to compounds having the formula: (I) where R1-R6, a, b, and X are as defined in the specification, or a pharmaceutically acceptable salt thereof. These compounds have neprilysin inhibition activity. In another aspect, the invention relates to pharmaceutical compositions comprising such compounds; methods of using such compounds; and processes and intermediates for preparing such compounds.