3.3.2. Camphoratin N (**2**)

Yellow solid; [α] 25 <sup>D</sup> +194.9 (c 0.1, MeOH); IR (KBr) νmax: 3495, 2944, 2926, 2892, 1736, 1713, 1674, 1458, 1378, 1238, 1200, 1167, 1065, 901 cm−1; UV (MeOH) λmax: 267 nm; ESI–MS *m*/*z* 521 [M + Na]+; HR-ESI-MS *m*/*z* 521.2876 ([M + Na]<sup>+</sup>) (Calcd. for C30H42O6Na: 521.2879); 1H-NMR (CDCl3, 400 MHz) δ 4.91 (1H, s, H-28), 4.87 (1H, s, H-28), 4.11 (1H, s, H-12), 3.67 (3H, s, OCH3), 3.13 (1H, q, *J* = 7.1 Hz, H-25), 3.03 (1H, dd, *J* = 7.3, 12.4 Hz, H-14), 2.93 (1H, ddd, *J* = 2.7, 7.0, 2.7 Hz, H-1), 2.55 (1H, m, H-6), 2.54 (1H, m, H-2), 2.45 (1H, m, H-6), 2.43 (1H, m, H-4), 2.41 (1H, m, H-2), 2.40 (1H, m, H-15), 2.11 (1H, m, H-23), 1.99 (1H, m, H-16), 1.99 (1H, m, H-5), 1.96 (1H, m, H-23), 1.87 (1H, m, H-17), 1.58 (1H, m, H-22), 1.55 (1H, m, H-16), 1.54 (3H, s, H-19), 1.47 (1H, m, H-1), 1.44 (1H, m, H-15), 1.42 (1H, m, H-20), 1.28 (3H, d, *J* = 7.1 Hz, H-27), 1.20 (1H, m, H-22), 1.04 (3H, d, *J* = 6.6 Hz, H-29), 0.97 (3H, d, *J* = 6.5, H-21), 0.67 (3H, s, H-18). 13C-NMR (CDCl3, 100 MHz) δ 210.7 (C-3), 201.9 (C-11), 200.1 (C-7), 150.3 (C-9), 148.4 (C-24), 145.3 (C-8), 80.4 (C-12), 49.3 (C-13), 48.5 (C-5), 45.6 (C-17), 43.9 (C-4), 41.7 (C-14), 39.0 (C-6), 37.9 (C-10), 37.5 (C-2), 35.3 (C-20), 34.5 (C-1), 33.8 (C-22), 31.2 (C-23), 26.8 (C-16), 23.8 (C-15), 17.9 (C-21), 16.3 (C-19), 11.4 (C-18).
