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?? ???? >(2R,3R,5S)-3β-Methyl-4,7-dioxo-1-azabicyclo[3.2.0]heptane-2-carboxylic acid pivaloyloxymethyl ester
(2R,3R,5S)-3β-Methyl-4,7-dioxo-1-azabicyclo[3.2.0]heptane-2-carboxylic acid pivaloyloxymethyl ester
(2R,3R,5S)-3β-Methyl-4,7-dioxo-1-azabicyclo[3.2.0]heptane-2-carboxylic acid pivaloyloxymethyl ester ??
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(2R,3R,5S)-3β-Methyl-4,7-dioxo-1-azabicyclo[3.2.0]heptane-2-carboxylic acid pivaloyloxymethyl ester C??? ??, ??, ??
(2R,3R,5S)-3β-Methyl-4,7-dioxo-1-azabicyclo[3.2.0]heptane-2-carboxylic acid pivaloyloxymethyl ester ?? ?? ? ???
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(2R,3R,5S)-3β-Methyl-4,7-dioxo-1-azabicyclo[3.2.0]heptane-2-carboxylic acid pivaloyloxymethyl ester ?? ??
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