_XYLENE, also called dimethylbenzene, is a petroleum product also used for killing submerged weeds in moving water.
2.
It adds to the Re face of FAD at the N-5 position, and the enzyme holds FAD in place through hydrogen bonding with the pyrimidine portion and hydrophobic interactions with the dimethylbenzene portion.
3.
Oil from other nearby tanks was, according to a Greenpeace report released several weeks after the incident, intentionally released to prevent the fire from expanding towards a tank containing dimethylbenzene, a flammable chemical.