(1S,5R,6S)-2-(1,2-Dimethyl-4-pyridinio)thiomethyl-6-<(R)-1-hydroxyethyl>-1-methylcarbapen-2-em-3-carboxylate

p-Methoxybenzyl (1S,5R,6S)-2-Chloromethyl-1-methyl-6-<(R)-1-triethylsilyloxyethyl>carbapen-2-em-3-carboxylate

(1S,5R,6S)-2-(2,3-Cyclopenteno-1-methyl-4-pyridinio)thiomethyl-6-<(R)-1-hydroxyethyl>-1-methylcarbapen-2-em-3-carboxylate

(1S,5R,6S)-6-<(R)-1-Hydroxyethyl>-1-methyl-2-(1-phenyl-4-pyridinio)thiomethylcarbapen-2-em-3-carboxylate

(1S,5R,6S)-2-(2-Dimethylcarbamoyl-1-methyl-4-pyridinio)thiomethyl-6-<(R)-1-hydroxyethyl>-1-methylcarbapen-2-em-3-carboxylate