Answer: orcinols

AnswerCrossword Clue
orcinolswhite, crystalline, water-soluble solid, C7H8O2, sweet but unpleasant in taste, that reddens on exposure to air: obtained from many lichens or produced synthetically and used chiefly as a reagent for certain carbohydrates
orcinolsORCINOL, a chemical obtained from lichen, also ORCINE