(1R,5S,6S,8R,2'S,4'S)-2-(2-(3-carboxyphenylcarbamoyl)pyrrolidin-4-ylthio)-6-(1-hydroxyethyl)-1-methylcarbapenem-3-carboxylic acid
(4R,5R,6S)-3-((3S,5S)-5-((3-Carboxyphenyl)carbamoyl)pyrrolidin-3-yl)sulfanyl-6-(1-hydroxyethyl)-4-methyl-7-oxo-1-azabicyclo(3.2.0)hept-2-ene-2-carboxylic acid