Pipercyclobutanamide D, a new member of the cyclobutanamide-type alkaloid, from the roots of .

From the EtOH-soluble extract of the roots of , one new dimeric alkamide, pipercyclobutanamide D () was isolated. Its structure was elucidated on the basis of NMR spectroscopic interpretation. The relative configuration of was determined based on the NOESY analysis.