Table 1.

¹H and ¹³C NMR assignments for tanikolide seco acid 2.^a

Position	δC	δH
1	176.8	-
2	34.6	2.29 (t J= 6.7 Hz)
3	19.1	1.67 (m)
4	35.5	1.49 (m)
5	74.4	-
6	36.2	1.49 (m)
7	22.7	1.29 (br s)
8	29.9	1.29 (br s)
9	29.6	1.29 (br s)
10	29.6	1.29 (br s)
11	29.6	1.29 (br s)
12	29.6	1.29 (br s)
13	29.6	1.29 (br s)
14	32.3	1.29 (br s)
15	23.1	1.29 (m)
16	13.4	0.91 (t J= 6.9 Hz)
17	67.1	3.59 (d, J=14.1 Hz)
		3.68 (d, J=14.1 Hz)

^a400 MHz ¹H and 100 MHz for ¹³C NMR; CD₃OD as solvent.