Table 5 NMR spectral data (500 MHz for ¹H and 125 MHz for ¹³C) of compound 3

2

71.7

4.19 (d, 11.1)

4.07 (d, 11.1)

C-3, C-4, C-8a, C-9

3

72.2

4

198.1

5

164.1

6

95.7

6.01 (d, 6.01)

C-4a, C-8

7

165.3

8

97.0

6.04 (s)

C-4a, C-6, C-7

9

40.6

2.94 (d, 7.0)

C-3, C-4, C-1′, C-2′

1′

126.0

2′

131.5

7.13 (d, 8.3)

C-3′, C-4′, C-6′,

3′

113.7

6.86 (d, 8.3)

C-1′, C-4′, C-5′

4′

158.8

5′

113.7

6.86 (d, 8.3)

C-1′, C-3′, C-4′

6′

131.5

7.13 (d, 8.3)

C-2′, C-4′, C-5′

4a

100.5

8a

163.0

4′-OCH₃

55.2

3.80 (s)

C-4′

3-OH

-

3.40 (s)

C-2, C-4, C-4a,

5-OH

-

11.29 (s)

C-4, C-4a C-5