Butylhydroxytoluene (Butylated hydroxytoluene, BHT, ionol, dibunol, agidol-1, E321).
Formula (CH3)(tert-C4H9)2C6H2OH.
In its pure form-white powder. Technical ionol-yellow powder.
It is used as an antioxidant in the production of food products, lubricants, rubbers, plastics, etc.
It is also a starting compound for the synthesis of various derivatives of spatially hindered phenols, many of which have biological activity or are used in industry.