Table 3 ¹H-NMR data for compounds 16, 19, and 20 (CD₃OD)

4

7.72 (s)

4

5

7.23 (s)

7.41 (s)

5

7.35 (s)

8

7.01 (s)

7.00 (s)

8

6.99 (s)

11

5.17 (2H, s)

11

12

5.39 (2H, s)

12

5.41 (2H, s)

2′

6.86 (d, 1.5)

6.85 (d, 1.6)

2′

6.91 (s)

5′

6.94 (d, 7.9)

6.98 (d, 8.0)

5′

7.03 (s)

6′

6.80 (dd, 1.5, 7.8)

6.82 (dd, 1.6, 8.1)

6′

6.76 (dd, 1.6, 8.0)

3′-OCH₂O-4′

5.98 (s)

6.06 (s)

3′-OCH₃

3.86 (3H, s)

5.94 (s)

6.00 (s)

4′-OCH₃

3.70 (3H, s)

4-OCH₃

4.31 (3H, s)

4-OCH₃

4.03 (3H, s)

6-OCH₃

3.85 (3H, s)

3.95 (3H, s)

6-OCH₂O-7

6.17 (2H, d)

7-OCH₃

3.64 (3H, s)

3.72 (3H, s)