Coumarins form the seeds of Poncirus trifoliata L.

In a general research program on furocoumarins and coumarins from this plant we recently de­ scribed 4 the identification of the five furocouma­ rins, bergapten, imperatorin, isopimpinellin, prangenin and prangenin hydrate in the seeds obtained from ripe fruits of plants cultivated in the area of Padua. We are now reporting the isolation of two coumarinic derivatives, i. e. 7-geranyloxycoumarin (aurapten) and 6-methoxy-7-geranyloxycoumarin from these seeds.