Catechin 5-''O''-glucoside is a flavanol glucoside. It can be found in

rhubarb Rhubarb is the fleshy, edible stalks ( petioles) of species and hybrids (culinary rhubarb) of ''Rheum'' in the family Polygonaceae, which are cooked and used for food. The plant is a herbaceous perennial that grows from short, thick rhizomes. ...

and in the bark of ''

Rhaphiolepis umbellata ''Rhaphiolepis umbellata'' or Sexton's bride is a species of flowering plant in the family Rosaceae, native to Korea, Japan and Taiwan. Growing to tall and wide, it is an evergreen shrub with glossy oval leaves, and scented white flowers, some ...

''. It can also be formed from (+)-catechin by plant-cultured cells of '' Eucalyptus perriniana''. )

References

Flavanols Flavonoid glucosides {{aromatic-stub