Table 1.

NMR Spectroscopic Data for Clathric Acid (1)^a

position	δC, mult.	δH(J in Hz)	HMBCb	ROESY
1	180.0, C
2a	33.5, CH2	2.45, d (12.8)	1, 3, 4, 8	2b, 21b, H3-20
2b		2.33, d (12.8)		2a, 21b
3	55.1, CH	2.35, bs	4, 7, 8, 20
4	151.3, C
5a	39.2, CH2	2.37, m	3, 4, 6, 21	5b, 6a, 6b
5b		2.06, m		5a
6a	26.6, CH2	1.60, m	4, 8, 12	13
6b		1.34, m		5a, H3-20
7	55.3, CH	1.32, bs	3, 9, 19, 20	13
8	40.2, C
9a	40.1, CH2	1.69, dt (12.5, 3.0)		9b, 10b, H3-20
9b		1.23, td (12.5, 3.0)	2, 7	9a
10a	20.5, CH2	1.65, m	8, 12
10b		1.56, m		9a, H3-19, H3-20
11a	42.3, CH2	1.39, m	7, 9, 19
11b		1.39, m
12	41.4, C
13	147.0, CH	5.37, d (15.5)	7, 11, 15, 19	6a, 7, 15
14	124.4, CH	6.12, dd (15.5, 10.5)	12, 15, 16	H3-18, H3-19
15	127.3, CH	5.77, d (10.5)	13, 17, 18	13, H3-17
16	133.5, C
17	26.6, CH3	1.75, s	15, 16, 18	15
18	18.8, CH3	1.74, s	15, 16, 17	14
19	19.2, CH3	1.04, s	7, 11, 12, 13	10b, 14, H3-20
20	16.0, CH3	0.80, s	3, 7, 8, 9	2a, 6b, 9a, 10b, H3-19
21a	107.6, CH2	4.72, bs	3, 5	21b
21b		4.60, bs	3, 5, 4	2a, 2b, 21a

^aIn CD₃OD, 500 MHz for ¹H and 125 MHz for ¹³C NMR.

^bHMBC correlations are from proton(s) stated to the indicated carbons.