Table 1.

¹H (500 MHz) and ¹³C (125 MHz) NMR spectroscopic data for 4a-O-methoxyarugosin H (1) (CDCl₃)

Position	δ C, type	δ H (J (Hz))	HMBC
1	160.4, C
2	125.2, C
3	134.9, CH	7.12, d (8.5)	1, 1'
4	105.5, CH	6.12, d (8.5)	2, 4a, 9a
4a	170.5, C
4a-OMe	53.2, CH3	4.03, s	4a
5	128.0, CH	7.16, s	6, 6-Me, 7, 10a
6	139.8, C
6-Me	15.2, CH3	2.24, s	5, 6, 7
7	154.8, C
8	113.7, C
8a	125.3, C
9	198.3, C
9a	103.5, C
10a	140.2, C
11	194.1, CH	9.98, s	7, 8, 8a
1'	27.8, CH2	3.28, d (7.0)	1, 2, 3, 2', 3'
2'	121.5, CH	5.25, t (7.0)	2, 1', 4', 5'
3'	133.7, C
4'	25.9, CH3	1.72, s	2', 3', 5'
5'	17.9, CH3	2.24, s	2', 3', 4'
1-OH		10.93, s	1, 2, 9a
7-OH		11.38, s	6, 7, 8

NMR: nuclear magnetic resonance; HMBC: heteronuclear multiple bond correlation.