Anthraquinones from the Roots of Kniphofia insignis and Evaluation of Their Antimicrobial Activities

Table 1

¹H-NMR (400 MHz, CDCl₃) and ¹³C-NMR (125 MHz) spectral data of compounds 1, 2, and 3.

Position	1		2		3
	δH (m, J in Hz)	δC	δH (m, J in Hz)	δC [10]	δH (m, J in Hz)	δC [11]
1	—	162.9	—	162.9	—	161.8
1′	—	—	—	162.2	—	161.9
1a	—	114.0	—	114.8	—	112.6
1′a	—	—	—	113.9	—	114
2	7.14 (1H, s)	124.6	7.73 (1H, s)	125.6	6.83 (1H, d, J = 4)	117.2
2′	—	—	7.16 (1H, s)	121.4	7.06 (1H, d, J = 4)	124.3
3	—	149.1	—	149.0	—	148.9
3′	—	—	—	149.2	—	149.6
3′-CH3	—	—	2.53 (3H, s)	149.2	2.47 (3H, s)	22.0
4	7.73 (1H, d, 4)	120.8	—	137.3	6.63 (1H, brs)	120.9
4a	—	133.2	—	132.8	—	148.4
4′a	—	—	—	134.0	—	133.3
4′	—	—	7.87 (1H, s)	120.4	7.66 (1H, d, J = 4)	120.9
5	—	158.3	7.88 (1H, d, J = 8)	124.3	6.80 (1H, d, J = 4)	119.9
5a	—	112.5	—	130.4	—	148.3
5′a	—	—	—	131.1	—	132.8
5′	—	—	8.0 (1H, d, J = 8)	120.0	8.03 (1H, d,J = 8)	119.3
6	7.32 (1H, d, 8.0)	129.5	7.73 (1H, s)	137.2	7.43 (1H, t, J = 8)	137.3
6′	—	—	7.65 (1H, d, J = 8)	135.0	8.67 (1H, d, J = 8)	132.2
7	7.32 (1H, d, 8.0)	129.6	7.34 (1H, d, J = 8)	124.2	6.98 (1H, d, J = 8)	116.9
7′	—	—	—	133.5	—	142.2
8	—	157.6	—	162.8	—	161.5
8′	—	—	—	159.7	—	159.1
8a	—	112.8	—	115.7	—	114.7
8′a	—	—	—	115.5	—	115.9
9	—	190.6	—	192.8	—	193.0
9′	—	—	—	192.8	—	192.1
10	—	186.6	—	182.4	—	70
10′	—	—	—	181.9	—	181.5
3-CH3	2.51 (3H, s)	22.3	2.33 (3H, s)	22.3	—	22.2
1-OH	12.17 (1H, s)	—	12.53 (1H, s)	—	11.81 (1H, s)	—
1′-OH	—	—	12.45 (1H, s)	—	12.38 (1H, s)	—
5-OH	13.04 (1H, s)	—	—	—	—	—
8-OH	12.36 (1H, s)	—	12.09 (1H, s)	—	12.18 (1H, s)	—
8′-OH	—	—	12.00 (1H, s)	—	12.48 (1H, s)	—