2-Formyl-1-methylpyridinium trichloroacetate oxime 3687-33-0 6735-59-7 Pyridinium, 2-((hydroxyimino)methyl)-1-methyl-, salt with trichloroacetic acid (1:1) (9CI) Pyridinium, 2-formyl-1-methyl-, trichloroacetate, oxime TCIA