2-tert-butyl-4-hydroxyanisole,
3-tert-butyl-4-hydroxyanisole
It can be added to the food itself, or to the packaging material.
Primarily used to prevent fats from becoming rancid.
bha: InChI=1/C11H16O2/c1-3-4-6-9-7-5-8-10(13-2)11(9)12/h5,7-8,12H,3-4,6H2,1-2H3
bht: InChI=1/C15H24O/c1-10-8-11(14(2,3)4)13(16)12(9-10)15(5,6)7/h8-9,16H,1-7H3