Table 2.

¹H (500 MHz, CDCl₃) and ¹³C (125 MHz, CDCl₃) NMR data and ¹H–¹H COSY and HMBC correlations for cembrane 2.

Position	δH (J in Hz)	δC, Multiple	1H–1H COSY	HMBC
1	2.75 m	35.9, CH	H2-2, H2-14	C-14
2	1.59 m; 1.41 m	25.1, CH2	H-1, H2-3	C-4, -15
3	1.78 m; 1.52 m	35.8, CH2	H2-2	C-4, -5, -18
4		78.9, C
5		213.6, C
6	2.70 m	34.2, CH2	H2-7	C-5, -7, -8
7	2.55 m; 2.21 m	31.5, CH2	H2-6	C-5, -6, -8, -9, -19
8		134.5, C
9	5.13 dd (6.0, 6.0)	126.5, CH	H2-10, H3-19	C-7, -10, -11, -19
10	2.10 m; 2.01 m	22.8, CH2	H-9, H2-11	C-8, -9, -11, -12
11	1.96 m; 1.56 m	36.7, CH2	H2-10	C-9, -10, -12, -13
12		60.8, C
13	2.79 dd (9.5, 4.0)	59.4, CH	H2-14	C-14
14	1.99 m; 1.42 m	32.4, CH2	H-1, H-13	C-1, -12, -13, -15
15		141.9, C
16		171.3, C
17	6.42, s; 5.57 s	126.2, CH2		C-1, -15, -16
18	1.35 s	25.7, CH3		C-3, -4, -5
19	1.66 s	17.0, CH3	H-9	C-7, -8, -9
20	1.27 s	18.2, CH3		C-11, -12, -13