Table 2.

¹H (400 MHz, CDCl₃) and ¹³C (100 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	2.85 m	35.4, CH	H2-2, H2-14	n.o. a
2/2′	1.49 m; 1.32 m	28.2, CH2	H-1, H2-3	C-1, -3, -4, -14, -15
3/3′	1.79 ddd (13.6, 11,2, 5.6); 1.64 m	37.2, CH2	H2-2	C-1, -2, -4, -5, -18
4		78.9, C
5		213.8, C
6/6′	2.76 ddd (18.0, 8.0, 3.2); 2.65 ddd (18.0, 10.2, 3.2)	35.1, CH2	H2-7	C-5, -7, -8
7/7′	2.48 m; 2.33 m	31.8, CH2	H2-6	C-5, -6, -8, -9
8		134.8, C
9	5.15 dd (5.6, 5.6)	126.1, CH	H2-10, H3-19	C-7, -10, -19
10	2.18 m	23.1, CH2	H-9, H2-11	C-8, -9, -11, -12
11/11′	1.87 dd (8.4, 2,8); 1.69 m	36.7, CH2	H2-10	C-9, -12, -13
12		73.9, C
13	4.29 dd (9.2, 6.0)	79.1, CH	H2-14	C-1, -14, -20
14	1.91 m	26.2, CH2	H-1, H-13	C-12, -13, -15
15		138.0, C
16		165.5, C
17a/b	6.43 d (1.2); 5.56 dd (1.2, 1.2)	128.4, CH2		C-1, -15, -16
18	1.35 s	25.2, CH3		C-3, -4, -5
19	1.66 s	17.2, CH3	H-9	C-7, -8, -9
20	1.31 s	24.1, CH3		C-11, -12, -13
OH-4	3.24 br s			C-5

^a n.o. = not observed.