Table 2. NMR data of 2 (DMSO-d₆) and 2′ (CDCl₃).

Position	2		2′
	δH (J in Hz)	δC	δH (J in Hz)	δC
1		119.0		124.8
2	6.56 d (1.6)	107.6	6.82 d (1.9)	108.9
3		145.6		151.2
4		140.0		142.1
5		148.1		153.2
6	7.19 d (1.6)	107.1	7.30 d (1.9)	107.4
7		166.7		166.5
7-COOH	12.74 brsa)
7-COOMe			3.80 s	52.1
5-OCH3	3.84 s	48.6	3.93 s	56.28
4-OH	9.62 brs
4-OCH3			4.04 s	61.0
1′		134.8		135.9
2′,6′		152.7		153.0
3′,5′	7.36 s	106.6	7.37 s	106.8
4′		128.2		127.3
7′		166.9		166.8
7′-COOH	12.74 brsa)
7′-COOMe			3.95 s	52.4
2′,6′-OCH3	3.77 s	56.2	3.82 s	56.30

^a) Overlapping signals.