allo-Imperatorin: A Potent Urease Inhibitor from Fresh Unripe Fruits of Aegle marmelos (Rutaceae)

Abstract

During the search for bioactive constituents from different parts of Aegle marmelos (Rutaceae), the ethanol soluble portion of fresh unripe fruits yielded two known amides named aegeline (1) and 2-O-methyl aegeline (2), and five known coumarins named xanthotoxol (3), alloimperatorin (4), marmesin (5), marmin (6), 7′-O-methylmarmin (7). Structures of 1-7 were elucidated with the aid of spectroscopic techniques. All the isolated constituents (1-7) were tested for urease inhibition. allo-Imperatorin was found the most potent among the all tested samples with the IC₅₀ value 27.5 µM.