131924-52-2 2-(1-Methyl-1H-1,2,3-triazol-5-yl)-6-nitro-4H-1-benzopyran-4-one 4H-1-Benzopyran-4-one, 2-(1-methyl-1H-1,2,3-triazol-5-yl)-6-nitro- BRN 4201910