Answer: mannitol

AnswerCrossword Clue
mannitolwhite, crystalline, sweetish, water-soluble, carbohydrate alcohol, C6H8(OH)6, occurring in three optically different forms, the common one being found in the manna of the ash Fraxinus ornus and in other plants: used
mannitolan alcohol, also MANNITE
mannitolthe substance used as an osmotic diuretic to reduce intraocular and intracranial pressures