Methyl tertiary-butyl ether (MTBE), also known as methyl tert-butyl ether and tert-butyl methyl ether, is an organic compound with a structural formula.

What is MTBE used for?
Methyl tert-butyl ether (MTBE) is a flammable liquid that has been used as an additive for unleaded gasoline since the 1980s. MTBE increases octane and oxygen levels in gasoline and reduces pollution emissions.