The chemical Imipenem has a designated molecular formula of C12H17N3O4S and a molecular weight of 299.345 g/mol. Synonyms may include: EINECS 264-734-5, N-Formimidoylthienamycin, Imipenemum [Latin], MK 0787, MK-787, Tienamycin, (5R,6S)-3-((2-(Formimidoylamino)ethyl)thio)-6-((R)-1-hydroxyethyl)-7-oxo-1-azabicyclo(3.2.0)hept-2-ene-2-carboxylic acid, (5R,6S)-6-((R)-1-Hydroxyethyl)-3-(2-(iminomethylamino)ethylthio)-7-oxo-1-azabicyclo(3.2.0)hept-2-ene-2-carbonsaeure, Imipemide, Imipenemum (ChemID). Imipenem has been assigned a MeSH pharmacological action of: Antibacterial.