Table 1.

NMR data for lyngbyoic acid (4) in CDCl₃ (500 MHz)

C/H No.	δC, mult.a	δH (J in Hz)	COSY	HMBCb
OH		10.18, br
1	180.7, s
2	34.5, t	2.42, t (7.5)	H-3a, H-3b	1, 3, 4
3a	29.6, t	1.56, m	H2-2, H-4	1, 2, 4, 6
3b		1.52, m	H2-2, H-4	1, 2, 4, 5, 6
4	18.3, d	0.45, m	H2-5, H-3a, H-3b	5,c 7c
5	12.0, t	0.21, m (2H)	H-4, H-6	3, 4, 6, 7
6	19.2, d	0.45, m	H2-5, H-7a, H-7b	5,c 7c
7a	34.3, t	1.21, m	H-6, H-7b, H2-8	4, 5, 6, 8
7b		1.13, m	H-6, H-7a, H2-8	4, 5, 6, 8
8	29.8, t	1.33, m	H-7a, H-7b, H2-9	6, 7
9	29.7,d t	1.25, m	H2-8	7
10	29.5,d t	1.25, m		12
11	32.1, t	1.25, m		12
12	22.2, t	1.27, m	H2-11, H3-13	11, 13
13	14.0, q	0.88, t (7.0)	H2-12	11, 12

^aMultiplicity is derived from APT and HSQC spectra.

^bProtons showing long-range correlation to indicated carbon.

^cIt could not be distinguished which proton shows HMBC correlations to C-5 and C-7.

^dAssignment of these carbons is interchangeable.