CH3 CH3 H OCH3 NHCH3 OH HO CH3 Diradical inte rmediate unde rgoes H atom transfer with NHCH3 ribose backbone in DNA HO HOOH O O O O CH3 O OCH3 O O O NHCH3 HO HO CH3 O CH3 O OCH3 O O O NHCH3 HO HO CH3 O O O OH . . Diradical intermediate undergoes H atom transfer with ribose backbone in DNA