According to The Alcohol Textbook:
Otherwise known as 2-propanone, dimethyl ketone or pyroacetic ether. It is a volatile, very flammable liquid with a characteristic pungent 'mousey' odor and a sweetish taste. Chemical formula CH3COCH3. Boils at 56.5°C and frezes at -94°C. It is miscible with water, ethanol and most oils. Inhalation may cause headaches, and in large amounts, narcosis. It is a congeners in the production of ethanol by fermentation particularly from molasses mashes. It is also a by-product of the production of butanol by Anaerobic Fermentation using the baterium Clostridium acetobutylicum. It tends to concentrate in the heads fraction in the rectification of neutral spirit.