Ethyl 2-(2-thiophen-2-ylacetyl)sulfanylacetate   、                                                                                      
头孢呋辛杂质7   、                                                                                      trimethylsilyl 7-amino-3-(carbamoyloxymethyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate                                                                                                                                                                                                                                                                                                          生成                                                 
(6R-trans)-3-[(carbamoyloxy)methyl]-8-oxo-7-(2-thienylacetamido)-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid