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(2007/10/02)pivaloyloxy 6-oxopenicillanate
Pivaloyloxymethyl (2S,5R,6R)-3,3-dimethyl-7-oxo-6-(2-oxo-propyl)-4-thia-1-azabicyclo<3.2.0>heptane-2-carboxylate
(2S,5R)-3,3-Dimethyl-7-oxo-6-[2-oxo-prop-(Z)-ylidene]-4-thia-1-aza-bicyclo[3.2.0]heptane-2-carboxylic acid 2,2-dimethyl-propionyloxymethyl ester
6-aminopenicillanic acid pivaloyloxymethyl ester
2,2-Dimethyl-propionic acid 2-[(2R,3R)-2-[2-(4-bromo-2-chloro-6-methyl-phenoxy)-acetylsulfanyl]-4-oxo-3-(2-oxo-propyl)-azetidin-1-yl]-2-oxo-acetoxymethyl ester
(3R,4R)-3-(2-Oxo-propyl)-4-<(4-bromo-2-chloro-6-methyl)phenyloxyacetyl>thio-azetidin-2-one
Allyl (5R,6R)-6-(2-oxo-propyl)-3-<(4-bromo-2-chloro-6-methyl)phenyloxymetyl>-7-oxo-4-thia-1-azabicyclo<3.2.0>hept-2-ene-2-carboxylate
(3R,4R)-3-(2-Oxo-propyl)-4-<(4-bromo-2-chloro-6-methyl)phenyloxyacetyl>thio-1-<1-(allyloxycarbonyl)-1-oxo>-azetidin-2-one