(1)Benzopyrano(2,3-d)-1,2,3-triazol-9(1H)-one, 6,7-dimethyl- 6,7-Dimethyl-(1)benzopyrano(2,3-d)-1,2,3-triazol-9(1H)-one 6,7-Dimethyl-9-oxo-1H,9H-benzopyrano(2,3-d)-v-triazole 75020-35-8