Table 1.

¹H NMR Data for Compounds 7a/b–9a/b (600 MHz).

Position	7a a	7b a	8a b	8b b	9a c	9b c
3	3.74, m	3.74, m			3.50, m	3.50, m
4a	3.17, m	3.17, m	3.65, s	3.19, s	2.98, dd e	2.976, dd e
4b	2.490, dd d	2.489, dd d			2.41, dd f	2.40, dd f
5-OCH3	3.55, s	3.55, s	3.71, s	3.51, s	3.52, s	3.52, s
6-OCH3					3.541, s	3.535, s
7′	7.544, s	7.538, s	4.22, s	4.34, s	7.391, s	7.388, s

^a acetone-d₆, ^b methanol-d₄, ^c DMSO-d₆, ^d J = 16.8, 7.8 Hz, ^e J = 16.8, 10.8 Hz, ^f J = 16.8, 3.0 Hz.