Table 4 ¹H and ¹³CNMR spectroscopic data for nocamycin III (4) and nocamycin IV (5)

1

175.5

Not observed

2

116.6

7.17, d (15.7)

Not observed

7.33, d (14.2)

3

150.3

7.60, d (15.7)

Not observed

7.56, d (15.6)

4

135.3

136.5

5

144.5

6.05, d (10.2)

144.0

6.04, d (9.4)

6

34.6

2.89, m

35.7

2.97, m

7

78.2

3.66, dd (11.2, 2.0)

79.3

3.75, dd (11.3, 1.6)

8

35.2

2.0, m

36.7

1.95, m

9

70.7

4.0, t (6.3)

71.7

4.04, t (6.2)

10

23.9

1.98, m; 2.4, m

24.4

2.16, m; 2.43, m

11

125.9

5.84, d (3.5)

125.8

6.23, d (4.2)

12

130.8

135.7

13

101.3

100.8

14

43.7

1.94, m

45.2

1.89, dd (14.1, 7.0)

15

68.9

4.29, dq (8.5, 6.3)

69.0

4.36, dq (12.5, 6.3)

16

20.7

1.23, d (6.3)

20.6

1.22, d (6.3)

17

12.4

1.92, s

12.6

1.94, s

18

17.0

1.07, d (7.0)

17.7

1.09, d (6.8)

19

13.2

0.71, d (6.9)

13.4

0.79, d (6.9)

20

18.0

1.62, s

62.2

3.96, d (13.1); 4.07, d (14.9)

21

11.8

0.79, d (7.0)

11.2

0.85, d (6.9)

1′

2′

176.7

Not observed

3′

Not observed

Not observed

4′

192.8

Not observed

5′

51.7

3.84, s

52.0

3.79, s