Echinacoside and caffeoyl conjugates protect collagen from free radical-induced degradation: a potential use of Echinacea extracts in the prevention of skin photodamage. - Facino ,R.M,.; Carini ,M,.; Aldini ,G,.; Saibene ,L,.; Pietta ,P,.; Mauri ,P.. (Planta Medica, 1995)