“…C NMR (75 MHz, MeOH-d 4 ): δ C 182.8 (C-9), 162.2 (C-1), 161.9 (C-3), 157.1 (C-4a), 148.3 (C-5), 146.7 (C-10a), 125.0 (C-7), 122.5 (C-8a), 120.7 (C-6), 115.8 (C-8), 111.0 (C-4), 105.3 (C-9a), 100.2 (C-2), 94.2 (C-2'), 47.2 (C-3'), 33.4 (C-4'), 29.1 (C-5'), 28.9 (C-6').Pruniflorone M (2)1 H NMR (300 MHz, MeOH-d 4 ): δ H 13.15 (1H, s, 1-OH), 7.64 (1H, dd, J = 7.7 and 2.0 Hz, H-8), 7.26 (1H, dd, J = 7.7 and 2.0 Hz, H-6), 7.20 (1H, t, J = 7.7 Hz, H-7), 6.23 (1H, s, H-2), 4.49 (1H, t, J = 6.0 Hz, H-2'), 3.89 (2H, d, J = 6.0 Hz, H 2 -1'), 1.69 (3H, s, H 3 -5') a , 1.44 (3H, s, H 3 -4') a . 13 C NMR (75 MHz, MeOH-d 4 ): δ C 182.3 (C-9), 167.6 (C-1), 165.5 (C-3), 154.0 (C-4a), 148.0 (C-5), 147.8 (C-10a) b , 125.0 (C-7), 122.7 (C-8a), 121.2 (C-6), 116.2 (C-8), 114.2 (C-4), 104.7 (C-9a) b , 96.0 (C-2'), 94.4 (C-2), 61.7 (C-1'), 44.4 (C-3'), 27.1 (C-5') c , 21.1 (C-4') c .…”