The chemical Pemirolast potassium has a designated molecular formula of C10H7KN6O and a molecular weight of 266.305 g/mol. Synonyms may include: BMY 26517, CCRIS 3562, 9-Methyl-3-(1H-tetrazol-5-yl)-4H-pyrido(1,2-a)pyrimidin-4-one, potassium salt, TBX, Alamast, UNII-497A17OUUE (ChemID). Pemirolast potassium has been assigned a MeSH pharmacological action of: Histamine Antagonist.