Table 2 ¹H and ¹³C NMR data of compound 3 (δ in ppm, data obtained in CDCl₃, 500 MHz)

1

161.7, C

2′

166.0, C

3

152.6, C

3′

136.7, C

4

102.6, CH

6.37, s

4′

137.7, C

4a

127.4, C

5′

129.4, CH

8.13, s

5

134.6, C

6′

121.4, CH

7.53, d, 7.8

6

118.2, CH

6.88, d, 2.2

7′

130.9, CH

7.65, like t, 7.8

7

159.5, C

8′

115.8, CH

7.05, d, 7.8

7-OMe

55.9, C

3.79, s

9′

139.9, C

8

112.3, CH

7.62, d, 2.2

10′

126.3, C

8a

129.8, C

11′

132.2, C

9

46.4, CH₂

3.63, s

12′

124.2, C

10

203.2, C

13′

31.6, CH

2.84, q, 6.8

11

30.1, CH₃

2.15, s

14′/15′

23.5, 2CH₃

1.40, d, 6.8

12

43.8, CH₂

4.14, s

16′

57.0, CH₂

5.24, s

16′-OH

4.97, br s