... Volume: Page: ... the flavonoid fractions of Ulex airensis Espírito-Santo, Cubas, Lousã, Pardo & Costa and Ulex europaeus L. ssp. ... onogenin (10), 20 the flavone atalantoflavone (11), 21 and the pterocarpans (6aR,11aR)-(−)2-hydroxypterocarpin (5), 22,23 ...