Inhibitory Effect on β-Hexosaminidase Release from RBL-2H3 Cells of Extracts and Some Pure Constituents of Benchalokawichian, a Thai Herbal Remedy, Used for Allergic Disorders

Table 3

NMR spectrum data (500 MHz for ¹H and 125 MHz for  ¹³C) of compound 1.

Position	^1H (mult., in Hz.)^a	^13C	HMBC (^1H→^13C)
2	—	164.2
3	6.57 (s)	103.8	C-2, C-4, C-4a, C-1′
4	—	183.0
4a	—	105.8
5	—	152.1
6	—	130.3
7	—	154.9
8	6.59 (s)	93.3	C-6, C-7, C-8a
8a	—	153.2
1′	—	123.6
2′	7.83 (dd, 8.9, 1.9)	128.1	C-2, C-4′, C-6′
3′	7.01 (dd, 8.9, 1.9)	114.5	C-1′, C-4′, C-5′
4′	—	162.6
5′	7.01 (dd, 8.9, 1.9)	114.5	C-1′, C-3′, C-4′
6′	7.83 (dd, 8.9, 1.9)	128.1	C-2, C-2′, C-4′
5-OH	13.10 (s)		C-4a, C-5, C-6
7-OH	6.53 (s)		C-6, C-7, C-8
4′-OCH3	3.90 (3H, s)	55.5	C-4′
6-OCH3	4.04 (3H, s)	60.8	C-6

Note. Compound 1 in CDCl₃; if not indicated; the integration of each proton signal equal to one proton.