(2008/06/13)
p. 900 - 907
(2007/10/03)4-nitrobenzyl (1R,5S,6S)-6-[(R)-1-hydroxyethyl]-1-methyl-2-[(S)-1-methyl-5-oxopyrrolidin-3-ylthio]-1-carbapen-2-em-3-carboxylate
(R)-4-(4-nitrobenzoyloxy)-1-methyl-2-oxopyrrolidine
(S)-4-t-butyldimethylsilyloxy-1-methyl-2-oxopyrrolidine
thioacetic acid S-(1-methyl-5-oxo-pyrrolidin-3-yl) ester
(S)-3-mercapto-1-methyl-5-oxopyrrolidine