2,4-dihydroxy-benzoic acid ; compound with triethylamine 、
3-bromomethyl-7α-chloro-1,1-dioxoceph-3-em-4-carboxylic acid tert-butyl ester 生成 (6R,7S)-7-Chloro-3-(2,4-dihydroxy-benzoyloxymethyl)-5,5,8-trioxo-5λ
6-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid tert-butyl ester