Table 1.

NMR Spectroscopic Data for the Mixture of Plakortinic Acids A and B (2 and 3) in CDCl₃^a

position	δCb	type	δH, mult (J in Hz)c
1	174.5	C
2α	43.9	CH2	2.76, d (14.8)
2β			2.72, d (14.8)
3	83.9	C
4α	55.7d	CH2	2.25, d (12.5)
4β			2.44, d (12.5)
5	86.6a	C
6α	39.5	CH2	1.71, dd (14.0, 4.6)
6β			1.52, dd (14.0, 7.5)
7α	24.3d	CH2	1.38, m
7β			1.30, m
8	29.8a	CH2	1.30, m
9	29.7	CH2	1.30, m
10α	28.2d	CH2	1.39, m
10β			1.28, m
11α	30.7	CH2	1.58, m
11β			1.38, m
12	39.8	CH	2.03, m
13	35.6a	CH	2.41, ddd (8.4, 9.7 Hz)
14	68.9a	CH	3.93, dd (9.7, 3.3)
15	67.8	CH	4.11, dd (5.8, 3.3)
16	121.3	CH	5.56,d (5.8)
17	143.1	C
18	42.1	CH	2.34, t (8.4)
19	49.2	CH	1.66, br m
20α	28.8	CH2	1.58, br m
20β			1.49, br m
21	11.9	CH3	0.91, t (7.5)
22	23.8	CH3	1.46, s
23	23.2a	CH3	1.29, s
24	21.3	CH3	1.65, s

^aAssignments are based on DEPT, HSQC, HMBC, ¹H-¹H COSY and NOESY experiments.

^bRecorded at 125 MHz.

^cRecorded at 500 MHz.

^dThis resonance consists of two closely-spaced signals with partial overlap. This trait heightens in benzene-d₆ solution.