Table 1 ¹H and ¹³C NMR data of 1~3.

2

74.7, CH

4.50, ddq (11.0, 3.6, 6.2)

76.4, CH

4.68, qd (6.5, 3.2)

79.5, CH

4.14, dq (10.6, 6.2)

3

44.3, CH₂

2.78, dd (17.4, 11.0)

45.0, CH

2.82, qd (7.3, 3.2)

47.4, CH

2.66, dq (10.6, 7.0)

2.70, dd (17.4, 3.6)

4

199.7, C

203.2, C

201.9, C

4a

103.2, C

102.27, C

102.5, C

5

165.5, C

ND^a

165.2, C

5a

105.2, C

104.8, C

105.2, C

6

160.9, C

160.5 C

160.8, C

7

101.0, CH

6.19, br.s

100.8, CH

6.28, d (2.1)

100.9, CH

6.18, d (2.0)

8

163.4, C

163.2, C

163.2, C

9

102.5, CH

6.37, d (1.6)

102.33, CH

6.53, d (2.1)

102.3, CH^b

6.354, d (2.0)

9a

143.9, C

143.6, C

143.8, C

10

101.9, CH

6.39, s

101.5, CH

6.46, s

101.8, CH^b

6.348, s

10a

156.7, C

155.8, C

156.4, C

2-CH₃

21.2, CH₃

1.46, d (6.2)

16.7, CH₃

1.39, d (6.5)

20.0, CH₃

1.46, d (6.2)

3-CH₃

9.8, CH₃

1.21, d (7.3)

10.4, CH₃

1.22, d (7.0)