Benzhydryl 6β-(α-methoxybenzylideneamino)-penicillanate

(6R)-7t-((Ξ)-2-tert-butoxycarbonylamino-2-phenyl-acetylamino)-8-oxo-3-(4-oxo-4H-pyridin-1-ylmethyl)-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester

(6R)-3-acetoxymethyl-7t-(4-nitro-benzyloxycarbonylamino)-8-oxo-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester

diphenylmethyl 2,3-dimethoxy-27-methoxymethoxy-2,3-dioxo-2,3-secoolean-12-en-28-oate

(6R)-7t-((Ξ)-2-tert-butoxycarbonylamino-2-phenyl-acetylamino)-5ξ,8-dioxo-3-(2-oxo-2H-pyridin-1-ylmethyl)-(6rH)-5λ4-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester