Table 1.

¹H (600 MHz) and ¹³C (150 MHz) NMR spectroscopic data for enhygromic acid (1) in DMSO-d₆.

Position	δC, Type	δH (J in Hz)	HMBC a
1	170.2, C
2	127.2 (br), C
3	145.9 (br), CH	7.27, s	4
4	52.2, C
5	46.7, CH	2.81, brd (7.1)	4
6	148.9, C
7a	35.3, CH2	2.08, m
7b		2.39, dt (13.1, 3.0)
8a	21.7, CH2	1.36, m
8b		1.55 m
9	45.2, CH	2.04, m	4
10	31.7, CH	1.55, m
11a	29.4, CH2	1.09, m
11b		1.42, m
12	21.6, CH2	1.43, m; 1.45, m	4
13	46.9, CH	1.49, dd (12.7, 3.4)
14	35.6, C
15a	40.6, CH2	1.35, m	4
15b		1.92, m
16a	108.1, CH2	4.76, s	5, 6, 7
16b		4.85, d (1.5)
17	19.6, CH3	0.76, d (6.9)
18	32.6, CH3	1.00, s	13, 14
19	26.7, CH3	0.86, s	14, 15
20	14.7, CH3	1.92, s	1, 2, 3

^a HMBC correlations are from proton(s) started to the indicated carbon.