“…13 C-NMR (CDCl 3 ) δ ppm: 161.4 (C-2), 158.7 (C-7), 153.0 (C-8a), 149.1 (C-5), 144.9 (C-2'), 140.1 (C-4"), 139.6 (C-4), 119.4 (C-3"), 116.7 (C-6), 112.6 (C-3), 107.6 (C-4a), 105.0 (C-3'), 94.3 (C-8), 69.8 (C-2"), 26.4 (C-5''), 18.1 (C-6''). The above data were consistent with the literature data [20,21].…”