methyl 2-<2'S-(benzothiazol-2-yl)dithia-4'-oxo-3'S-phenoxycarbonylaminoazetidin-1'-yl>-3-methylenebutanoate                                                                                                                                                              在
                                                                                                                                                                                 
磺酰氯                                                                                                                                  作用下,
                                                                                                                                                                                                                            生成                                                 
methyl-2-<2'R-chloro-4'-oxo-3'S-phenoxycarbonylaminoazetidin-1'-yl>-3-chloromethyl-3-chlorosulfenylbutanoate   、                                                                                             methyl-2-<2'S-chloro-4'-oxo-3'S-phenoxycarbonylaminoazetidin-1'-yl>-3-chloromethyl-3-chlorosulfenylbutanoate