The OH radicals may react with the pentoxifylline molecule
by extracting a proton from the adjacent NeCHx groups
leading to radicals, which are subsequently oxidized following
the three routes described in Fig. 10. It is expected that OH
radicals attack the double bonds of pentoxifylline molecule,
followed in some circumstances by isomerization, or by bond
breakage (e.g. CeN to N). Cycle opening may take place as
well, followed by radical attack.