| abstract |
The invention is concerned with the compounds of formula I: n n n n n n n n n n and pharmaceutically acceptable salts and esters thereof, wherein R 1 -R 4 are defined in the detailed description and claims. In addition, the present invention relates to methods of manufacturing and using the compounds of formula I as well as pharmaceutical compositions containing such compounds. The compounds of formula I are antagonists at the CRTH2 receptor and may be useful in treating diseases and disorders associated with that receptor such as asthma. |