potassium 8-ethyl-5,8-dihydro-5-oxo-2-(piperazinyl)pyrido[2,3-d]pyrimidine-6-carboxylate

8-Ethyl-5,8-dihydro-5-oxo-2-(1-piperazinyl)pyrido[2,3-d]pyrimidine-6-carboxylic acid potassium salt