Table 1.

¹H and ¹³C NMR data, ¹H–¹H correlation spectroscopy (COSY) and HMBC correlations for sesquiterpenoid 1.

Position	δH (J in Hz)	δC, Multiple	1H-1H COSY	HMBC
1		41.9, C
2	1.58 m	46.0, CH	H2-3, H-5	C-1, -6, -10, -13
3α	1.56 m	37.2, CH2	H-2, H-3β	C-1, -2
β	1.35 m		H-2, H-3α	C-2, -4, -14, -15
4		33.5, C
5	1.55 m	48.9, CH	H-2, H2-6	C-2, -14
6a	1.32 m	25.8, CH2	H-5, H-6b, H2-7	C-2, -4, -7
b	1.64 m		H-5, H-6a, H2-7	C -2, -4, -5, -7, -8
7a	1.61 m	34.2, CH2	H2-6, H-7b	C-5, -6, -8, -9, -12
b	1.78 dd (12.8, 5.6)		H2-6, H-7a	C-5, -8
8		52.6, C
9a	1.68 m	29.4, CH2	H-9b, H2-10	C-7, -8, -10, -11
b	2.14 dd (9.6, 7.6)		H-9a, H2-10	C-1, -8, -10, -11, -12
10a	1.44 m	45.4, CH2	H2-9, H-10b	n.o. a
b	1.68 m		H2-9, H-10a	C-8, -9, -11
11α	1.59 d (12.8)	48.9, CH2	H-11β	C-1, -2, -7, -8, -9, -10, -12
β	1.94 dd (12.8, 2.4)		H-11α	C-9, -10
12		184.2, C
13	0.93 s	22.0, CH3		C-1, -2, -10, -11
14	0.98 s	20.3, CH3		C-3, -4, -5, -15
15	0.98 s	30.5, CH3		C-3, -4, -5, -14

^a n.o. = not observed.