Biology Reference
In-Depth Information
The constituting monomeric unit of oligomers isolated from
Nuphar
japonicum
is an α-glucosidic compound (
e.g.
, 3,6-HHDP-1,2,4-
trigalloyl-α-
D
-glucose), and nupharins C (
63
) and F (
64
) (Ishimatsu
et
al
., 1989b) are unique examples of a dimer and a trimer possessing both
(
S
)- and (
R
)-HHDP units in the same molecule. Conversely,
tamaricaceous plants such as
Reaumuria hirtella
and
Tamarix
pakistanica
produce oligomers of tellimagrandin II (
1
). Hirtellin C (
65
)
(Yoshida
et al.
, 1993) is a dimer resulting from a double coupling of two
molecules of
1
and featuring both the
m
-GOG and
p
-GOG linking units.
Hirtellins T
1
(
66
) and Q
1
(
67
) (Ahmed
et al.
, 1994) are examples of a
trimer and a tetramer of this type, formed by repetition of the same
coupling mode. These oligomers might serve as chemotaxonomical
markers for the plant families
Rosaceae
,
Nymphaeaceae
, and
Tamaricaceae
.
OH
OH HO
HO
HO
OH
OH HO
OH
HO
O
O
HO
OH
HO
OH
O
O
HO
O
O
OH
OH
O
HO
O
HO
O
O
HO
O
O
O
O
OH
O
O
HO
HO
OH HO
OH
O
HO
O
OH
O
O
O
HO
OH
OH
HO
OH HO
HO
OH
OH
O
O
OH
HO
OH
O
O
OH
O
O
O
HO
OH
OH
O
O
O
O
O
O
HO
HO
OH
O
OH
O
O
O
O
O
HO
HO
O
HO
OH
O
O
O
O
HO
HO
OH
HO
OH
HO
OH
O
OH
OH
HO
OH
Nupharin C (
63
)
OH
O
O
O
O
O
HO
OH
O
O
HO
O
OH
O
O
O
HO
HO
O
Nupharin F (
64
)
HO
OH
