139157-69-0 1H-Imidazole, 2-((2,2-dimethyl-1,3-dioxan-5-ylidene)methyl)-1-methyl-5-nitro- 2-((2,2-Dimethyl-1,3-dioxan-5-ylidene)methyl)-1-methyl-5-nitro-1H-imidazole BRN 4813309