<chemical> 8-ethyl-5,8-dihydro-5-oxo-2-(1-pyrrolidinyl)pyrido (2,3-d)pyrimidine-6-carboxylic acid. Antibacterial against mainly gram negative organisms. It is used for urinary tract and intestinal infections. ... Pharmacological action: anti-infective agents, anti-infective agents, urinary. ... Chemical name: Pyrido(2,3-d)pyrimidine-6-carboxy...