2H-1-Benzopyran-2-one, 8-butoxy-3-(1H-tetrazol-5-yl)-, sodium salt 76239-51-5 8-Butoxy-3-(1H-tetrazol-5-yl)-2H-1-benzopyran-2-one sodium salt 8-n-Butoxy-3-(1H-tetrazol-5-yl)coumarin sodium salt