Richard M. Wiedhopf

Petalostetin, a new isoflavone from Petalostemon candidum

occurrence and it is significant because the oestrogenic Si gel. Using petrol with increasing amounts of C,H, as activity of a synthetic sample was found to be one fourth eluent sitosterol, lupeol, and rand p-amyrin were of that of the isomeric 5.7,4’-trihydroxyisoflavone [4]. isolated and identified by direct comparison with authenA comparison of the UV values of the aglucone with tic samples. those of the glucoside suggested the presence of the sugar moiety at position 7. Methylation of the glucoside with CH,N, for 30 hr and subsequent hydrolysis gave a Acknow!rtlgrinent -The authors are grateful to Prof. R. H.