A monoterpenoid substituted furocoumarin, furanyl)butoxy]-7H-furo[3-2-
g][1]benzopyran-7-one, was isolated from the rhizomes of Dorstenia bra
siliensis Lam. along with psoralen, bergapten, sitosterol, stigmastero
l, 3-O-beta-glucosylsitosterol and sucrose. Traces of a new unsaturate
d analogue, -dihydro-5,5-dimethyl-4-oxo-2-furanyl)-2-butenyl-] oxy]-7H
-furo[3-2-g][1]benzopyran-7-one, were identified by mass spectrometry.