“…Positive MS: m/z 465 (M + , 57%). IR n max /cm -1 3603, 3254, 1655, 1611, 1572, 1299, 1156, 1122, 950, 842, 603, 558 1. H NMR ((CD 3 ) 2 CO, 300 MHz): d 308.5 (H a ), 268.4 (H a ), 229.5 (H a ), 200.6 (H a ), 139.3 (9-Me, 3H), 85.5 (H a , 2H), 62.3 (4-Me, 3H), 36.2 (H a ), 29.5 (H a ), 20.5 (4-Me, 3H), 10.3 (H-sac), 9.4 (H-sac, 2H), 8.5 (H-sac), 5.8 (H 2 O), -9.6 (H b ), -11.5 (H b ), -13.1 (H b ), -18.5 (2-Me, 3H), -25.6 (H b ), -31.6 (H b ), -36.9 (H b ).…”