Table 2.

¹H, ¹³C NMR data of 5–7 (500/125 MHz, in CDCl₃, δ ppm, J in Hz).

No.	5		No.	6		No.	7
	δH	δc, type		δH	δc, type		δH	δc, type
1		161.7, C	1		126.5, C	1		154.3, C
2	6.71, d (8.0)	110.4, CH	2	6.71, s	116.9, CH	2	6.72, d (8.0)	114.9, CH
3	7.49, t (8.0)	136.7, CH	3		146.9, C	3	7.04, td (8.0, 2.0)	127.4, CH
4	6.80, d (8.0)	106.5, CH	4		131.2, C	4	6.77, t (7.5)	118.6, CH
4a		155.4, C	4a		141.6, C	5	7.29, dd (7.5, 1.0)	128.7,CH
5	7.18, s	119.5, CH	5a		164.7, C	6		129.8, C
6		142.4, C	6		97.3, C	7	5.01, d (3.5)	67.5, CH
7		153.5, C	7	6.36, d (1.5)	101.0, CH	8	3.32, dd (6.0, 3.5)	78.0, CH
8		133.9, C	8		165.5, C	9	3.58, dq (6.0, 6.0)	66.8, CH
8a		117.8, C	9	7.21, d (1.5)	104.5, CH	10	1.11, d (6.0)	19.7, CH3
9		184.2, C	9a		138.8, C	6-OH	9.33, br.s
9a		108.9, C	9b		109.4, C
10a		153.8, C	10	2.60, s	24.8, CH3
11	4.99, s	56.7, CH2	11		164.2, C
12	2.40, s	17.2, CH3	COOH	11.84, s
13	3.81, s	62.6, CH3
1-OH	12.53, s
11-OH	4.37, br.s