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P-nitrobenzyl-6-(1-hydroxyethyl)-1-azabicyclo(3.2.0)-heptane-3,7-dione-2-carboxylate (BCK)

 
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 P-nitrobenzyl-6-(1-hydroxyethyl)-1-azabicyclo(3.2.0)-heptane-3,7-dione-2-carboxylate (BCK)
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