Uncommon Trimethoxylated Flavonol Obtained from Rubus rosaefolius Leaves and Its Antiproliferative Activity

Table 1

¹H and ¹³C NMR data of compound  1 in DMSO-d6.

Position	^1H NMR	^13C NMR	HMBC
2		146.3
3		135.8
4		176.4
5		147.3
6		131.0
7		150.6
8		127.7
9		144.5
10		102.4
1′		123.4
2′, 6′	8.24 d (9.0)	129.2	C-2, C-2′6′, C-4′
3′, 5′	7.17 d (9.0)	114.2	C-1′, C-3′5′, C4′
4′		160.5
OMe-4′	3.80 s	55.4	C-4′
OMe-6	3.79 s	60.2	C-6
OMe-8	3.85 s	61.1	C-8
OH-3	9.56 s
OH-5	10.38 s
OH-7	12.26 s		C-6, C-9, C-10

in PPM; in Hz; ¹H NMR at 300 MHz and ¹³C NMR at 75 MHz.