See Table 1.
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Physicochemistry: Pemirolast potassium occurs as a light yellow crystalline powder. It is freely soluble in water, slightly soluble in methanol, and very slightly soluble in ethanol (99.5). It dissolves in potassium hydroxide TS.
Nonproprietary name: Pemirolast potassium.
Chemical name: Monopotassium 5-(9-methyl-4-oxo-4H-pyrido[1,2-a]pyrimidin-3-yl)-1H-tetrazol-1-ide.
Molecular formula: C10H7KN6O.
Molecular weight: 266.30.
Melting point: About 322°C (with decomposition).