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(2007/10/02)pivaloyloxy 6-oxopenicillanate
6-aminopenicillanic acid pivaloyloxymethyl ester
(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
Pivaloyloxymethyl (2S,5R,6R)-3,3-dimethyl-7-oxo-6-(2-oxo-propyl)-4-thia-1-azabicyclo<3.2.0>heptane-2-carboxylate
phenylacetyl chloride