Sodium (1S,5R,6S)-6-<(R)-1-hydroxyethyl>-1-methyl-2-(1-methyl-1H-tetrazol-5-yl)thiomethylcarbapen-2-em-3-carboxylate

Sodium (1S,5R,6S)-2-(1-carbamoylmethyl-1H-tetrazol-5-yl)thiomethyl-6-<(R)-1-hydroxyethyl>-1-methylcarbapen-2-em-3-carboxylate

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

p-Methoxybenzyl (1S,5R,6S)-1-methyl-2-(4-pyridyl)thiomethyl-6-<(R)-1-triethylsilyloxyethyl>carbapen-2-em-3-carboxylate