[Chemical constituents of Incarvillea younghusbandii].

Objective: To study the chemical constituents of Incarvillea younghusbandii.

Method: The chemical constituents were isolated by various column chromatographic methods and structurally identified by NMR and MS evidence.

Result: Fifteen compounds were obtained and identified as isobergapten (1), sphondin (2), imperatorin (3), xanthotoxin (4), phellopterin (5), heraclenol (6), rivulobirin A (7), methyl oleanolate (8), methyl caffeate (9), grevillic acid (10), boschniakinic acid (11), tert-O-beta-D-glucopyranosyl-(R)-heraclenol (12), 5-methoxy-8-O-beta-D-glucopyranosyloxypsoralen (13), 1'-O-beta-D-glucopyranosyl-3-hydroxynodakenetin (14) and phenylethyl-O-beta-D-glucopyranosyl-(1-->2)-beta-D-glucopyranoside (15).

Conclusion: All of these compounds were isolated from this plant for the first time and most of them are furocoumarins.