already a trace of oxygen mediates the one-electron transfer from 3,4-benzopyrene ( benzo ( a ) pyrene , bp ) to hydrogen peroxide or to tert . butyl hydroperoxide ( rooh ) , leading in this way to generation of highly reactive ho x , ho2 x or ro x and ro2 x radicals in nonpolar solvents at biological temperatures .
C0005082
benzopyrene
C0005052
benzo ( a ) pyrene