Table 5.

¹H and ¹³C NMR data of 4 and 5 (acquired in DMSO-d₆).

Position	4		5
	δC, Type	δH (J in Hz)	δC, Type	δH (J in Hz)
1	106.9, CH	6.12, d (1.9)	106.9, CH	6.12, d (2.1)
2	158.5, C		158.5, C
3	101.2, CH	6.10, d (1.9)	101.2, CH	6.10, d (2.1)
4	158.5, C		158.5, C
5	106.9, CH	6.12, d (1.9)	106.9, CH	6.12, d (2.1)
6	137.5, C		137.5, C
7	38.7, CH2	3.65, s	38.8, CH2	3.64, s
8	167.6, C		167.7, C
9	113.2, CH	6.04, d (2.3)	113.3, CH	6.04, d (2.3)
10	178.7, C		178.7, C
11	113.2, CH	6.07, dd (2.3, 0.9)	114.0, CH	6.05, d (2.3)
12	165.8, C		166.9, C
13	19.2, CH3	2.20, d (0.9)	42.6, CH2	2.52, d (3.7)
14			64.0, CH	3.90, m
15			23.2, CH3	1.06, d (6.1)
2-OH		9.22, s		9.22, s
4-OH		9.22, s		9.22, s
14-OH				4.80, d (5.1)