2H-1-Benzopyran-2-one, 6-ethyl-7-methoxy-3-(1H-tetrazol-5-yl)- 6-Ethyl-7-methoxy-3-(1H-tetrazol-5-yl)-2H-1-benzopyran-2-one 6-Ethyl-7-methoxy-3-(1H-tetrazol-5-yl)coumarin 76239-43-5