Answer: furan

AnswerCrossword Clue
furancolorless, liquid, unsaturated, five-membered heterocyclic compound, C4H4O, obtained from furfural: used chiefly in organic synthesis
furana chemical used in tanning, also FURANE, FURFURAN
furana cyclic flammable liquid compound C4H4O that is obtained from wood oils of pines or made synthetically and is used especially in organic synthesis