Table 1. NMR Spectroscopic Data [CDCl₃, 800 MHz (¹H), 200 MHz (¹³C), δ (ppm)] for Neurolobatins A (1) and B (2).

	neurolobatin A (1)				neurolobatin B (2)
position	δH (J in Hz)	δC	HMBCa	NOESY	δH (J in Hz)	δC	HMBCa	NOESY
1		194.8				194.7
2a	2.77 dd (16.4, 3.2)	34.5	C-1, C-3	H-3, H-5a, H-15, H-6	2.81 dd (16.9, 2.5)	35.9	C-1, C-3	H-3, H-9
2b	3.27 dd (16.4, 9.9)		C-1, C-3	H-3, H-5a, H-6	3.22 dd (16.9, 10.1)		C-1, C-3	H-3, H-9
3	4.07 dd (9.7, 2.7)	79.0	C-1, C-4, C-5, C-15	H-2a, H-2b, H-9, H-14, H-15	4.14 dd (10.1, 2.6)	80.7	C-1, C-2, C-4, C-5, C-15	H-2a, H-2b, H-9, H-14, H-15
4		81.9				79.0
5a	2.40 dd (14, 4.1)	40.7	C-6, C-7	H-2a, H-2b, H-6, H-15	2.45 dd (13.8, 5.1)	38.5	C-3, C-4, C-6, C-7, C-15	H-6
5b	1.84 dd (14.0, 11.8)		C-3, C-6, C-7, C-15	H-6, H-15	2.01 dd (13.8, 11.8)		C-6, C-7
6	4.91 ddd (11.8, 9.4, 3.9)	73.7	C-7	H-2a, H-2b, H-5b	4.71 td (10.5, 5.1)	74.1	C-7	H-5a, H-9, H-15
7	3.45 dddd (9.0, 4.1, 3.7, 3.1)	46.3	C-5, C-6, C-12	H-5a, H-8	3.23 dq (9.9, 3.1)	46.2	C-5, C-6, C-12	H-13a
8	5.40 t (4.1)	68.4	C-6, C-1′	H-9	5.43 t (2.5)	67.1	C-6, C-1′
9	5.62 d (4.1)	98.9	C-4, C-7	H-3, H-8, H-15	5.35 d (1.9)	102.0	C-4, C-7, C-8	H-2a, H-2b, H-3, H-6
10		196.4				196.4
11		134.1				134.7
12		169.2				169.2
13a	5.38 d (3.1)	121.3	C-7, C-11		5.47 d (3.4)	121.3	C-7, C-11	H-7
13b	6.26 d (3.7)		C-7, C-11, C-12		6.25 d (3.4)		C-7, C-11, C-12
14	2.37 s	23.5	C-10	H-3	2.40 s	23.5	C-10	H-3
15	1.40 s	23.0	C-3, C-4, C-5	H-2a, H-3, H-5a, H-5b, H-9	1.48 s	26.0	C-3, C-4, C-5	H-3, H-6
1′		172.5				172.2
2′	2.16 m	42.9	C-3′, C-4′, C-5′		2.20 m	43.0	C-3′, C-4′, C-5′
3′	2.01 m	25.6	C-2′, C-4′, C-5′		2.04 m	25.6	C-2′, C-4′, C-5′
4′	0.92 d (6.6)	22.3	C-2′, C-3′		0.93 d (6.7)	22.3	C-2′, C-3′
5′	0.93 d (6.6)	22.3	C-2′, C-3′		0.92 d (6.7)	22.3	C-2′, C-3′

^aHMBC correlations are from proton(s) stated to the indicated carbon.