1. Nakamura, Y., Nakamura, H., Wu, H., Kobayashi, J., and Ohizumi, Y., submitted (1985).
2. Lipopurealins were obtained as hydrochlorides by the described isolation procedure and the counter ion was analyzed by ion chromatography.
3. 2:colorless amorphous solids, m.p. 94–95°C; UV (MeOH) λmax 284 nm (ε 930); IR (KBr) vmax 2930, 2850, 1675, 1520, 1450 and 1250 cm−1.
4. 3:colorless amorphous solids, m.p. 93–95°C; UV (MeOH) λmax 284 nm (ε 930); IR (KBr) vmax 2930, 2850, 1675, 1540, 1455 and 1260 cm−1;13C-NMR (CD3OD) δ37.7 (t, C-1′), 30.9 (t, C-2′), 72.3 (t, C-3′), 152.8 (s, C-4′), 118.7 (s, C-5′), 134.4 (d, C-6′), 137.2 (s, C-7′), 28.8 (t, C-8′), 151.9 (s, C-9′), 165.4 (s, C-10′), 38.9 (t, C-11′), 25.8 (t, C-12′), 126.0 (s, C-13′), 110.7 (d, C-14′), 148.5 (s, C-15′), 176.3 (s, C-1), 37.2 (t, C-2), 27.1 (t, C-3), 30.2 (t, C-4), 30.4 (t, C-5), 30.7 (t, C-6≈C-9), 31.0 (t, C-10), 28.5 (t, C-11), 40.2 (t, C-12), 29.0 (d, C-13), 23.1 (q, C-14 and C-15).
5. 4:colorless amorphous solids, m.p. 108–110°C; UVB (MeOH) λmax 284 nm (ε 910); IR (CHCl3) vmax 2930, 2860, 1675, 1520 and 1450 cm−1.