Phenolic Compounds from the Rhizomes of Dioscorea bulbifera

One new bibenzyl, 7, and one new diarylheptanone, diobulbinone A (18), together with sixteen known compounds, 1–6 and 8–17, have been isolated form the rhizomes of Dioscorea bulbifera. Their structures were elucidated by NMR and MS analyses. Compound 7 showed high antioxidant capacity in FRAP assay and DPPH radical-scavenging activity.