Table 1.

NMR spectroscopic data for pentangumycin (1) (DMSO-d₆) and SEK90 (2) (DMSO-d₆).

Pentangumycin (1)				SEK90 (2)
Pos.	δC	δH (J in Hz)	HMBC	Pos.	δC	δH (J in Hz)	HMBC
1	156.7 C	-	-	1	166.5 C	-	-
2	108.7 CH	7.10 s	1, 4, 12b, 19	2	102.7 C	-	-
3	143.2 C	-	-	3	165.5 C	-	-
4	117.5 CH	7.44 s	1, 2, 4a, 5, 12b, 19	4	101.9 CH	5.68 (s br)	2, 5, 6
4a	136.6 C	-	-	5	160.6 C	-	-
5	135.1 CH	7.88 s	1, 4, 4a, 6a, 7, 12a, 12b, 13	6	36.1 CH2	3.55 (s br)	4, 5, 7, 8, 12
6	139.1 C	-	-	7	132.5 C	-	-
6a	131.2 C	-	-	8	120.1 CH	6.74 dd (7.7, N/A)	9, 10, 11, 12, 13
7	188.0 C	-	-	9	130.9 CH	7.2 dd (7.9, N/A)	7, 8, 10, 11, 12
7a	115.8 C	-	-	10	114.4 CH	6.77 dd (8.1, N/A)	8, 9, 11, 12, 13
8	160.5 C	-	-	11	153.3 C	-	-
9	123.0 CH	7.26 m	7a, 11	12	130.6 C	-	-
10	136.7 CH	7.73 t (7.5)	8, 11a	13	199.9 C	-	-
11	117.2 CH	7.50 dd (7.5, 0.93)	7a, 9, 10, 8, 12	14	115.3 C	-	-
11a	135.5 C	-	-	15	164.9 C	-	-
12	185.5 C	-	-	16	100.5 CH	6.11 d (2.4)	14, 15, 17
12a	140.0 C	-	-	17	166.3 C	-	-
12b	119.5 C	-	-	18	111.4 CH	6.04 dd (0.64, 2.4)	13, 14, 15, 16, 20
13	132.2 C	-	-	19	142.7 C	-	-
14/18	129.9 CH	7.26 m	6, 14/18, 16	20	21.2 CH3	1.8 s	14, 18, 19
15/17	114.8 CH	6.78 dt (8.5, 2)	13, 15/17, 16	21	29.5 CH	4.36 t (8.2)	1, 2, 3, 22, 23
16	156.6 C	-	-	22	31.5 CH2	1.75 dt (7.3, 8.2)	2, 21, 23, 24
19	42.4 CH2	4.43 d (6)	2, 3, 4, 20	23	20.6 CH2	1.05 dq (7.3)	21, 22, 24
20	169.6 C	-	-	24	13.8 CH3	0.89 t (7.3)	22, 23
21	22.8 CH3	1.93 s	20	-	-	-	-
22	56.1 CH3	3.88 s	1	-	-	-	-
NH	-	8.53 t (br)	19, 20	-	-	-	-
OH1	-	-	-	-	-	12.67 s	14, 15, 16
OH2	-	-	-	-	-	11.49 s (br)	-
OH3	-	-	-	-	-	10.38 s	16, 18
OH4	-	-	-	-	-	9.78 s	10, 11, 12