The present invention relates to compounds of the formula (I); wherein R.sup.1 is H, CH.sub.3 or OCH.sub.3; R.sup.3=H, OH, CH.sub.3, OCH.sub.3, O-glucose or benzoyloxy; R.sup.4=H; R.sup.5=H or OH; R.sup.6=H or OCH.sub.3; R.sup.7=H, CH.sub.3, OCH.sub.3, cinnamoyloxy or (3,4,5-trimethoxy)-benzoyloxy; R.sup.8=H, OH, CH.sub.3 or OCH.sub.3; or R.sup.7 and R.sup.8 form together a group 0-CH.sub.2--O; R.sup.9=H or OCH.sub.3; R.sup.10=H or N-acetyl, N-methyl-2-aminoethyl; to their use as medicament for the treatment of non-autoimmune type 2 diabetes mellitus and/or syndrome X, to dietary and pharmaceutical compositions containing them and to a method for the treatment of non-autoimmune type 2 diabetes mellitus and/or syndrome X in animals including humans, said method comprising the step of administering an effective dose of a compound of the formula (I) to animals including humans which are in need thereof. ##STR00001##