(1S,5R,6S)-2-(1,9-Ethano-1,2,3,4-tetrahydroquinolizino-8-yl)thiomethyl-6-<(R)-1-hydroxyethyl>-1-methylcarbapen-2-em-3-carboxylate

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

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

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