p. 1253 - 1256
(2007/10/02)t-butoxycarbonylhydrazine
benzhydryl 7-oxocephalosporanate
Diphenylmethyl (E)-7-t-butoxycarbonylhydrazono-3-acetoxymethyl-3-cephem-4-carboxylate
(R)-3-Acetoxymethyl-7-(tert-butoxycarbonyl-hydrazono)-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester