8-AMINO-2-(1H-TETRAZOL-5-YL)-4H-1-BENZOPYRAN-4-ONE;8-amino-2-(1H-tetrazol-5-yl)-4H-1-benzopyran-4-one (intermediate of pranlukast);8-Amino-4-oxo-2-(tetrazol-5-yl)-4H-1-benzopyran;8-Amino-2-tetrazol-5-yl-4-oxo-4H-1-benzopyran;8-AMino-4-oxo-2-(tetrazol-5-yl)benzopyran;8-AMino-2-(2H-tetrazol-5-yl)-4H-1-benzopyran-4-one;8-AMino-2-(1H-tetrazol-5-yl)-4H-chroMen-4-one;8-AMINO-4-OXO-2-(1H-TETRAZOLE-5-YL)-4H-1-BENZOPYRAN HYDROCHLORIDE