3d image of furan skeletal formula

furan oxole oxaannulene divinylene oxide furfuran oxacyclopentadiene epoxybutadiene heterocyclic five-membered aromatic ring volatile flammable solvent chloroform-like toxic carcinogenic speciality chemicals feist–benary synthesis paal–knorr synthesis lawesson's reagent electrophilic substitution safety thermal degradation roasted coffee espresso maker hepatocellular tumors poison venom toxicant toxic toxicity toxin toxicology poisoning danger hazard harmful intoxication detoxification carcinogen cancer carcinogenicity carcinogenesis tumor promotion malignancy 3d