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 4

NMR spectrum data (500 MHz for ¹H and 125 MHz for  ¹³C) of compound 2.

Position	^1H (mult., in Hz.)^a	^13C	HMBC (^1H→^13C)
2		162.5
3	5.99 (s)	111.8	C-2, C-2, C-4, C-4a
4		177.5
4a		108.5
5		160.6
6	6.29 (s)	96.4	C-4a, C-5, C-7, C-8
7		157.6
8		102.3
8a		154.3
1′  ×  2	1.47 (s)	28.2	C-1′, C-2′, C-3′
2′		77.9
3′	5.55 (d, 10.0)	127.3	C-2′, C-8
4′	6.70 (d, 10.0)	115.3	C-7, C-8, C-8a, C-2′
2-CH3	2.28 (3H, s)	19.6	C-2, C-3
5-OCH3	3.91 (s)	56.4	C-5

Note. Compound 2 in CDCl₃; if not indicated; the integration of each proton signal equal to one proton.