R-2-<(4-ethyl-2,3-dioxo-1-piperadinyl)formamido> phenylacetyl chloride   、                                                                                      
1-(3,4-dihydroxybenzoylamino)-4-thiopyridone   、                                                                                      diphenylmethyl (6R,7S)-7-amino-3-bromomethyl-7-formamidoceph-3-em-4-carboxylate                                                                                                                                                              在
                                                                                                                                                                                 
吡啶   、                                                                                                  
三氟乙酸                                                                                                                                  作用下,
                                                                                                                                                                                                                            生成                                                 (6R,7R)-3-[[1-[(3,4-dihydroxybenzoyl)amino]pyridin-1-ium-4-yl]sulfanylmethyl]-7-[[(2R)-2-[(4-ethyl-2,3-dioxopiperazine-1-carbonyl)amino]-2-phenylacetyl]amino]-7-formamido-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate