2H-1-Benzopyran-2-one, 8-hydroxy-3-(1H-tetrazol-5-yl)- 75055-18-4 8-Hydroxy-3-(1H-tetrazol-5-yl)-2H-1-benzopyran-2-one 8-Hydroxy-3-(1H-tetrazol-5-yl)coumarin