Angustifolinoid A, a macrocyclic flavonoid glycoside from Elaeagnus angustifolia flowers

•A novel macrocyclic flavonoid glycoside, angustifolinoid A (1), was isolated from Elaeagnus angustifolia flowers.•Angustifolinoid A (1) was determined by extensive spectroscopic analysis and electronic circular dichroism (ECD) calculation.•Angustifolinoid A (1) is baring an unprecedented 13-membered heterocyclic ring framework.