di·phen·yl·a·mine 
(dī-fĕn′əl-ə-mēn, -ămĭn, -fē′nəl-)
(dī-fĕn′əl-ə-mēn, -ămĭn, -fē′nəl-)n.
A colorless crystalline compound, C12H11N, used as a stabilizer for plastics, in analysis of oxidants, and in the manufacture of dyes, explosives, pesticides, and pharmaceuticals.