3d image of reum emodin skeletal formula

reum emodin anthraquinones laxative appetite stimulant astringent mucous membrane large intestine peristalsis anthraglycosides rhubarb rhei siccum anthracene herbal phytochemical phytotherapy plant herb natural herbalism pharmacognosy pharmacopoeia supplement biological activity bioactive nutrient prescription drug food additive nutraceutica dietary antioxidant healthy aging alternative medicine herbal cell biology biochemistry biomolecule biochemical molecule molecular formula skeletal structural structure geometry 3d medication treatment