Bioactive Compounds from Medicinal Plants in Myanmar
181
population for over 2000 years, as a natural cosmetic, sunscreen, skin preservation
treatment, and insect repellent. Thanakha is believed to make the skin smooth, clear,
and cool and increase the production of collagen and elastin to prevent wrinkles and
skin aging, and ameliorate excessive facial oil, serious acne, pimples, blackheads,
and whiteheads.
Hesperethusa crenulata is the accepted name of a species in the genus
Hesperethusa. The name is also a synonym of Limonia crenulata. In contrast, Limonia
acidissima is the accepted name of a species in the genus Limonia, and its synonym
O
HN
O
O R
1
R
2
R
3
236 (N-{[p-(3,7-dimethyl-(6R),7-dihydroxy-(4R)-octadecanoyloxy-2octenyloxy)phenyl]ethyl} benzamide)
237 (N-{[p-(3,7-dimethyl-(6R),7-dihydroxy-(4R)-9’’’(E)-octadecenoyloxy-2octenyloxy)phenyl]ethyl} benzamide)
238 (N-{[p-(3,7-dimethyl-(6R),7-epoxy-(4R)-9’’’(E)-octadecenoyloxy-2octenyloxy)phenyl]ethyl}benzamide)
R
1 =
O
R
2 = R
3 = OH
R
1 =
O
R
2 = R
3 = OH
R
1 =
O
R
2 and R
3 is bonded by -O13
5
5
5
5
O
O
O
O
O
HO
239 (limodissimin A)
O
HO
O
AcO
O
OAc
240 ((7'E)-(7R,8S)-4-hydroxy-3,5'-dimethoxy-4',7epoxy-8,3'-neolig-7'-en-9,9'-diyil diacetate)
Fig. 49 Structures of the three new benzamide derivatives 236–238, the dimeric coumarin 239, and
the neolignan 240 isolated from an ethyl acetate extract of L. acidissima bark grown in Myanmar