Two new -containing heterocyclic compounds from the roots of .

Two unusual -containing heterocyclic compounds, Plagranlines B-C, were isolated from the roots of . Plagranline B () was consisted of neolignane and monomeric quinoline constituent units and plagranline C () possessed pyridinone ring that was not commonly discovered in natural product. Their planar structures were elucidated based on analysis of NMR and HRESIMS spectroscopy data, and their absolute configurations were determined by quantum chemical calculations, including GIAO C NMR (DP4+) calculation and ECD calculation.