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(2007/10/02)Chloromethyl pivalate
6,6-dibromopenicillanic acid
(pivaloyloxy)methyl 6α-<1(R)-<<<(p-nitrobenzyl)oxy>carbonyl>oxy>ethyl>-1-oxopenicillanate
(pivaloyloxy)methyl 6α-<1(R)-<<<(p-nitrobenzyl)oxy>carbonyl>oxy>ethyl>penicillanate
(pivaloyloxy)methyl 6α-bromo-6β-<1(R)-hydroxyethyl>penicillanate
(pivaloyloxy)methyl 6α-<1(R)-<<<(p-nitrobenzyl)oxy>carbonyl>oxy>ethyl>-1-hydroxy-2-methylcarbapen-2-em-3-carboxylate
(pivaloyloxy)methyl 6α-<1(R)-<<<(p-nitrobenzyl)oxy>carbonyl>oxy>ethyl>-2-methyl-1-oxocarbapen-2-em-3-carboxylate
(pivaloyloxy)methyl 7α-<1(R)-<<<(p-nitrobenzyl)oxy>carbonyl>oxy>ethyl>-2-diazo-3-methyl-1β-oxoceph-3-em-4-carboxylate