(R)-2-[(4-nitrophenyl)sulfonyl-oxy]propanamide   、                                                                                      
5-hydroxy-N,N'-bis[2-hydroxy-1-(hydroxymethyl)ethyl]-2,4,6-triiodo-1,3-benzendicarboxamide sodium salt                                                                                                                                                              在
                                                                                                                                                                                 sodium hydroxide                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
1,4-二氧六环   、                                                                                         
水                                                                                  为溶剂,
                                                                                                                                                                                        以86%的产率得到(S)-5-(2-amino-1-methyl-2-oxoethoxy)-N,N'-bis[2-hydroxy-1-(hydroxymethyl)ethyl]-2,4,6-triiodo-1,3-benzenedicarboxamide