2H-1-Benzopyran-2-one, 8-(4-ethoxybutoxy)-3-(1H-tetrazol-5-yl)- 8-(4-Ethoxybutoxy)-3-(1H-tetrazol-5-yl)-2H-1-benzopyran-2-one 8-(5-Oxaheptyloxy)-3-(1H-tetrazol-5-yl)coumarin 80916-87-6