(3,6-difluoro-4-hydroxy-naphthalen-2-yl)-acetic acid methyl ester   、                                                                                      
2-溴-5-(乙砜基)吡啶   、                                                                                      
2-(4-fluoro-benzylidene)-succinic acid 1-methyl ester                                                                                                                                                                                                                                                                                                          以[4-(5-ethanesulfonyl-pyridin-2-yloxy)-3,6-difluoro-naphthalen-2-yl]-acetic acid methyl ester (20 mg, 48%) was obtained as a white solid, which的产率得到[4-(5-ethanesulfonyl-pyridin-2-yloxy)-3,6-difluoro-naphthalen-2-yl]-acetic acid methyl ester