Laboratory Acids

N -Butyric acid (from Ancient Greek: βο??τ???ρον, meaning "butter"), also known under the systematic name butanoic acid, abbreviated BTA,^[6] is a carboxylic acid with the structural formula CH₃CH₂CH₂-COOH. Salts and esters of butyric acid are known as butyrates or butanoates. Butyric acid is found in milk, especially goat, sheep and buffalo milk, butter, parmesan cheese, and as a product of anaerobic fermentation (including in the colon and as body odor). Butyric acid is present in, and is the main distinctive smell of, human vomit.^[9] It has an unpleasant smell and acrid taste, with a sweetish aftertaste similar to ether. Mammals with good scent detection abilities, such as dogs, can detect it at 10 parts per billion, whereas humans can only detect it in concentrations above 10 parts per million.

Imidazole is an organic compound. It is a white or colourless solid that is soluble in water, producing a mildly alkaline solution. In chemistry, it is an aromatic heterocycle, classified as a diazole, and having non-adjacent nitrogen atoms.