4-(methylsulfonyl)butanoic acid   、                                                                                      {[4-(2',4'-Diamino-6'-methyl-biphenyl-3-sulfonyl)-5-methylsulfanyl-thiophen-2-yl]-imino-methyl}-carbamic acid tert-butyl ester                                                                                                                                                              在
                                                                                                                                                                                 
二苯基膦叠氮化物   、                                                                                                  
N,N-二异丙基乙胺                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
1,4-二氧六环                                                                                  为溶剂,
                                                                                                                                                                                        以7%的产率得到4-{4',6'-Bis-[3-(3-methanesulfonyl-propyl)-ureido]-2'-methyl-biphenyl-3-sulfonyl}-5-methylsulfanyl-thiophene-2-carboxamidine trifluoroacetate