3d image of gentisin skeletal formula

gentisin xanthones 9h-xanthen-9-one hydroxy groups plant metabolite polyphenol aromatic ether gentisine gentianin gentianic acid supplement biological activity bioactive nutrient prescription drug food additive nutraceutica dietary antioxidant anti-cancer anti-aging healthy aging alternative medicine tcm traditional chinese herbal herbal phytochemical phytotherapy plant herb natural herbalism pharmacognosy pharmacopoeia parasympathomimetic alkaloid flavonoid phytoalexin phytoestrogen 3d molecule molecular formula skeletal structural structure geometry