Structure and synthesis of crombenin, a natural spirocoumaranone
Abstract
Crombenin, 4,4′,6,6′,7′-pentahydroxyisochroman-3′-spiro-2-coumaran-3-one, represents a new type of flavonoid compound related to the concomitant crombeone (5-hydroxypeltogynone) in Acacia crombei.