p-methoxybenzyl (1S,5R,6S)-1-methyl-2-<(5R)-2-methylisoxazolidin-5-yl>-6-<(1R)-1-(triethylsilyloxy)ethyl>carbapen-2-em-3-carboxylate

(4S,5R,6S)-3-Iodomethyl-4-methyl-7-oxo-6-((R)-1-triethylsilanyloxy-ethyl)-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-methoxy-benzyl ester

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

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

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