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Molecular structures of the conventional and newer antimicrobials in the carbapenem class: Imipenem, Panipenem, Meropenem, Ertapenem, Doripenem, Biapenem, Razupenem, Sanfatenip, Tebipenem, and Tomopenem. Red: carbapenem structure; blue: moiety that confers steric hindrance towards the action of β-lactamases; green: 1-ß methyl group that confers resistance against DHP-1 hydrolysis.
