172
N. N. Win and H. Morita
185 (isopanduratin A1) R
1 = Me, R
2 = H
186 (nicolaioidesin B) R
1 = H, R
2 = Me
178 (6-methoxypanduratin A) R
1 = R
4 = H, R
2 = R
3 = Me
179 (panduratin A) R
1 = R
3 = R
4 = H, R
2 = Me
180 (isopanduratin A2) R
1 = Me, R
2 = R
3 = R
4 = H
181 (hydroxypanduratin A) R
1 = R
2 = R
3 = R
4 = H
182 (panduratin C) R
1 = R
2 = H, R
3 = Me, R
4 =OH
183 and 184 (panduratins B1 and B2)
OH
O
O
O
O
O
O
O
O
OH
O
O
O
O
O
O
O
OH
HO
O
O
O
O
O
OH
O
O
O
OH
HOO
OH
OH
HO
O
Fig. 39 Structures of the known cyclohexenyl chalcones 178–186 isolated from a chloroform
extract of cultivated B. pandurata rhizomes in Myanmar