A new rotenoid, named 9-demethylclitoriacetal, together with the known comp
ounds, 11-deoxyclitoriacetal, 6-deoxyclitoriacetal, clitoriacetal and stemo
nal, was isolated from roots of Clitoria fairchildiana. Its structure was e
lucidated as 6a,12a-dihydro-6,9,11,12a-tetrahydroxy-2,3-dimethoxy-[1]benzop
yrano[3,4-b] [1]benzopyran-12(6H)-one (I), on the basis of spectroscopic an
d chemical evidence. (C) 1998 Published by Elsevier Science Ltd. All rights
reserved.