Non terpenoid bitters I- Furanochromone Bitter Principles: Sources: Fruits of Ammi visnaga Lam. (Umbelliferae) R2 R1 OMe O furanochromones R1 R2 Khellin CH3 OCH3 Khellol CH2OH H Khellol glucoside CH2O-glucose H Visnagin CH3 H