3d image of emodin skeletal formula

frangula emodin rhamnus rhamnaceae anthraquinone derivative anti-sars-cov sars angiotensin-converting enzyme ace2 casein kinase-2 ck2 anti-inflammatory anticancer anti-infection herbal phytochemical phytotherapy plant herb natural herbalism pharmacognosy pharmacopoeia supplement biological activity bioactive nutrient prescription drug food additive nutraceutica dietary alternative medicine herbal cell biology biochemistry biomolecule biochemical molecule molecular formula skeletal structural structure geometry 3d isomer