pipemidic acid pipemidic acid pipemidic acid is a member of the pyridopyrimidine class of antibacterials, which display some overlap in mechanism of action with analogous pyridone-containing quinolones. it was introduced in 1979 and is active against gram negative and some gram positive bacteria. it was used for gastrointestinal, biliary, and urinary infections. the marketing authorization of pipemidic acid has been suspended throughout the eu. pipemidic acidclinical dataahfs/drugs.cominternational drug namesatc codej01mb04 (who) identifiers iupac name 8-ethyl-5-oxo-2-piperazin-1-yl-5,8-dihydropyridopyrimidine-6-carboxylic acid cas number51940-44-4pubchem cid4831chemspider4665uniilt12j5hvr8keggd08379chebichebi:75250chemblchembl30116comptox dashboard (epa)dtxsid3023479 echa infocard100.052.283 chemical and physical dataformulac14h17n5o3molar mass303.322 g·mol−13d model (jsmol)interactive image smiles ccn1c=c(c(=o)c2=cn=c(n=c21)n3ccncc3)c(=o)o inchi inchi=1s/c14h17n5o3/c1-2-18-8-10(13(21)22)11(20)9-7-16-14(17-12(9)18)19-5-3-15-4-6-19/h7-8,15h,2-6h2,1h3,(h,21,22)key:johzpmxazqzxhr-uhfffaoysa-n