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rhubarb stalks red green food vegetable produce healthy antioxidant fiber vitamin C potassium calcium magnesium phosphorus zinc copper manganese iron folate niacin pantothenic acid pyridoxine choline betaine carotenoids anthocyanins flavonoids phenolic acids tannins lignans saponins resveratrol curcumin quercetin kaempferol myricetin isorhamnetin astragalin diosmetin luteolin apigenin naringenin hesperetin eriodictyol catechin epicatechin gallocatechin epigallocatechin proanthocyanidins ellagic acid ferulic acid caffeic acid p-coumaric acid salicylic acid sinapic acid rutin quercetin-3-O-glucoside kaempferol-3-O-glucoside myricetin-3-O-glucoside isorhamnetin-3-O-glucoside astragalin-3-O-glucoside diosmetin-3-O-glucoside luteolin-7-O-glucoside apigenin-7-O-glucoside naringenin-7-O-glucoside hesperetin-7-O-glucoside eriodictyol-7-O-glucoside catechin-7-O-glucoside epicatechin-7-O-glucoside gallocatechin-7-O-glucoside epigallocatechin-7-O-glucoside proanthocyanidins-7-O-glucoside ellagic acid-7-O-glucoside ferulic acid-7-O-glucoside caffeic acid-7-O-glucoside p-coumaric acid-7-O-glucoside salicylic acid-7-O-glucoside sinapic acid-7-O-glucoside rutin-7-O-glucoside