Jf. Zeng et al., MANUIFOLIN-D, MANUIFOLIN-E, AND MANUIFOLIN-F - NEW ISOFLAVONOIDS FROMMAACKIA-TENUIFOLIA, Journal of natural products, 60(9), 1997, pp. 918-920
Chemical examination of roots of Maackia tenuifolia yielded three new
isoflavans, manuifolins D, E, and F, along with the known (6aR,12aR)-p
terocarpin and (GaR,12aR)-maackiain. The new compounds were establishe
d as ,1-dimethyl-2-prepenyl)-4'-O-(3-methyl-2-butenyl)- 7,2'-dihydroxy
isoflavan (1), -dimethyl-2-propenyl)-7,2',4',-trihydroxyisoflavan (2),
and 8-(3-methyl-2-butenyl)-7,2',4'-trihydroxyisoflavan (3), respectiv
ely, by spectroscopic methods.