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A new C-3/C-3″-biflavanone named isochamaejasmin has been isolated from Stellera chamaejasme L. (Thymelaeaceae) and its structure has been elucidated by spectroscopic and chemical methods. Furthermore, the stereochemistry of some C-3/C-3″-biflavanones including isochamaejasmin was discussed.

Two new C-3/C-3″-biflavanones, neochamaejasmin A and B have been isolated from Stellera chamaejasme L. (Thymelaeaceae) and their structures have been elucidated on the basis of spectral data and some chemical evidence. Neochamaejasmin B is the first naturally occurring C-3/C-3″-biflavanone having the cis–trans geometry at the C-2/C-3 and C-2″/C-3″ positions.

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