Table 2.

¹H and ¹³C NMR data of 3 and 4 in MeOH-d₄.

No.	3		4
	δC, type	δH, mult (J in Hz)	δC, type	δH, mult (J in Hz)
1	163.2, C		161.7, C
2	116.3, CH	6.88, d (8.6)	114.7, CH	6.85, d (8.6)
3	132.7, CH	7.83, dd (2.1, 8.6)	130.7, CH	7.79, dd (2.2, 8.6)
4	123.7, C		123.4, C
5	136.3, CH	7.98, d (2.1)	134.9, CH	7.92, d (2.2)
6	111.3, C		110.8, C
7	169.6, C		168.1, C
8	80.0, C		76.3, C
9	97.4, C		96.3, C
10	69.8, C	3.56, dd (6.5, 10.5)	29.8, CH	2.85, dd (6.7, 13.5)
11a	71.1, CH2	3.61, s	65.8, CH2	3.65, dd (6.5, 10.5)
11b				3.56, dd (6.5, 10.5)
12	26.2, CH3	1.53, s	16.2, CH3	1.27, d (1.9)