Bioactive Compounds from Medicinal Plants in Myanmar
175
Fig. 42 Kayea assamica,
known as Theraphi. The
flowers are used in Myanmar
traditional medicine
O
R
HO
OH
HO
O
204 (theraphin A) R = 1-oxobutyl
205 (theraphin B) R = 2-methyl-1-oxobutyl
206 (theraphin C) R = 3-methyl-1-oxobutyl
O
HO
O
O
O
OH
207 (theraphin D)
O
O
R
2
R
1
R
4
R
3
208 (2-hydroxyxanthone) R
1 = R
3 = R
4 = H, R
2 = OH
209 (1,7-dihydroxyxanthone) R
1 = R
4 = OH, R
2 = R
3 = H
210 (5-hydroxy-1-methoxyxanthone) R
1 = OMe, R
2 = R
4 = H, R
3 = OH
Fig. 43 Structures of 204–210 isolated from an ethyl acetate extract of K. assamica bark from
Myanmar