2-Heptadecyl-1-methyl-1H-benzimidazole methyl sulphate 2-Heptadecyl-1-methylbenzimidazolium methyl sulfate 68867-65-2 EINECS 272-522-9 Sulfuric acid, monomethyl ester, compd. with 2-heptadecyl-1-methyl-1H-benzimidazole (1:1)