Table 3.

¹³C-NMR (150 MHz), ¹H-NMR (600 MHz) and HMBC spectral data of hexahydromecambrine A (4) in CDCl₃ (δ in ppm, J in Hz).

Position	13C (δ, CDCl3)	Type	1H (J, Hz)	HMBC (2J, 3J)
1	148.1	Cq	-	-
1a	129.0	Cq	-	-
1b	131.0	Cq	-	-
2	140.8	Cq	-	-
3	105.9	CH	6.46 (s)	C1, C2,C4
3a	124.0	Cq	-	-
4	27.3	CH2	2.93 (m) ax	C5
			2.71 (m) eq	C3a
5	54.9	CH2	3.11 (m) ax	C3a, C6a
			2.46 (m) eq
6a	65.7	CH	3.26 (m)	-
7	44.3	CH2	2.44 (m) ax	C1a
			1.58 (m) eq	C12, C9
7a	46.6	Cq	-	-
8	30.2	CH2	2.03 (m) ax	C7a, C10
			1.54 (m) eq	C12, C7a, C10
9	31.7	CH2	2.41 (m) ax
			1.46 (m) eq	C8, C7a, C10
10	67.1	CH	4.00 br, m
11	31.0	CH2	1.75 (m)	C12, C7a, C10
12	29.7	CH2	1.25 (m)
N-CH3	43.2	CH3	2.39 (s)	C5, C6a
(OCH2O)	100.5	CH2	5.90 (d, J = 1.2)	C1, C2
			5.86 (d, J = 1.2)	C1, C2