Guaiacin A and B, two new saponins, have been isolated from the leaves of G. OFFICINALE and were characterised on the basis of (13)C-NMR and FAD mass spectroscopy as 3- O-(beta- D-glucopyranosyl (1-->3)-alpha- L-arabinopyranosyl]-30-nor-olean-12,20(29)-dien-28- O-beta- D-glucopyranosyl ester ( 1)