1a

(CD₃OD, 600 MHz)

1b

(CD₃OD, 600 MHz)

1c

(DMSO-d₆, 600 MHz)

1

(DMSO-d₆, 500 MHz)

Positions

δ ¹H (mult, J)

δ ¹H (mult, J)

δ ¹H (mult, J)

δ ¹H (mult, J)

2

8.22 (1H, s)

8.12 (1H, s)

8.51 (1H, s)

8.48 (1H, s)

3

-

-

-

-

4

-

-

-

-

5

-

-

-

-

6

6.30 (1H, s)

-

6.49 (1H, d, 2.1 Hz)

6.48 (1H, d, 2.2 Hz)

7

-

-

-

-

8

-

6.36 (1H, s)

6.72 (1H, d, 2.1 Hz)

6.73 (1H, d, 2.2 Hz)

9

-

-

-

-

10

-

-

-

-

1'

-

-

-

-

2'/6'

7.51 (2H, d, 8.6 Hz)

7.49 (2H, d, 8.4 Hz)

7.53 (2H, d, 8.8 Hz)

7.51 (2H, d, 8.8 Hz)

3'/5'

7.00 (2H, d, 8.6 Hz)

6.99 (2H, d, 8.4 Hz)

7.02 (2H, d, 8.8 Hz)

7.00 (2H, d, 8.8 Hz)

4'

-

-

-

-

-OCH₃

3.79 (3H, s)

3.83 (3H, s)

3.80 (3H, s)

3.79 (3H, s)

5-OH

-

-

12.97 (1H, s)

-

1''

-

-

5.79 (1H, d, 8.0 Hz)

5.07 (1H, d, 7.3 Hz)

2''

-

-

5.11 (1H, m)

3.45 (1H, m)

3''

-

-

5.41 (1H, m)

3.28 (1H, m)

4''

-

-

5.03 (1H, m)

3.17 (1H, m)

5''

-

-

4.35 (1H, m)

3.30 (1H, m)

6''

-

-

4.20 (1H, m)

3.70 (1H, m)

4.10 (1H, m)

3.47 (1H, m)

2''-OAc

-

-

2.04 (3H, s)

-

3''-OAc

-

-

1.97 (3H, s)

-

4''-OAc

-

-

2.03 (3H, s)^a

-

6''-OAc

-

-

2.03 (3H, s)^a

-