Table 1.

¹H (500 MHz) and ¹³C NMR (126 MHz) Data for 8 and 8a^a

	8		8a
position	δC, type	δH (J in Hz)	δC, type	δH (J in Hz)	ΔδC(δ8a−δ8)
1	144.9, C		150.8, C		5.9
2	142.7, C		145.5, C		2.8
3	111.3, C		119.2, C		7.9
4	116.3, CH	7.37, d (2.2)	116.9, CH	7.40, d (2.2)	0.6
5	111.8, C		116.8, C		5.0
6	129.5, CH	6.54, d (2.2)	129.4, CH	6.49, d (2.2)	−0.1
1′	145.1, C		148.5, C		3.4
2′	138.8, C		145.0, C		6.2
3′	119.2, C		119.4, C		0.1
4′	149.0, C		152.6, C		3.6
5′	113.4, C		113.5, C		0.2
6′	114.2, C		121.7, C		7.5
−OH		7.08, br s
−OH		7.56, br s
1′-OCH3			61.6, CH3	3.79, s
4′-OCH3	61.1, CH3	3.87, s	61.0, CH3	3.91, s
2-OCH3			61.3, CH3	4.00, s

^aChemical shifts (δ) are referenced to residual CDCl₃ (¹H: 7.26/¹³C: 77.16 ppm).