12. QUINONES: STRUCTURE AND DISTRIBUTION
Anthraquinones
not found in the Rubiaceae
639
Digitolutein
(XXIV)
HO
Me
O
Emodin
(Physcion is the
6-Me ether)
C0 2 H
HO
1
Chrysophanol
(XXVI)
Rhein
(XXVII)
Aloe-emodin
(XXX)
Alaternin
e
(xxvm)
HO
|
MeOr^
lcH 2 OH
MeO^\
Obtusifolin/
(XXIX)
O
[1
OMe
Ίϊιί^]
ΟΗ
JvJ^l^Me
O
Obtusin-'
(XXXI)
Chry so- obtusirr
(XXXII)
Aurantio-obtusin -
(ΧΧΧΠΙ)
e Structure now established by synthesis (26).
f From the seeds of Cassia ohtusifolia Linn. (Leguminosae)
(27).