ethyl 3-(4-(1-((5-(4-(trifluoromethyl)phenyl)pyrazin-2-yl)amino)butyl)benzamido) propanoate   、                                                                                      
carbon dioxide-methanol   、                                                                                      
异丙胺                                                                                                                                                                                                                                                                      反应 0.07h,
                                                                                                                以to provide (+ and −)-3-(4-(1-((5-(4-(trifluoromethyl)phenyl)pyrazin-2-yl)amino)butyl)benzamido) propanoic acid (678 mg, 99.8%; from peak 1) and (643 mg, 94.5%; from peak 2)的产率得到3-(4-(1-((5-(4-(trifluoromethyl)phenyl)pyrazin-2-yl)amino)butyl)benzamido) propanoic acid