1. Kobayashi, J., Ishibashi, M., Nagai, U., and Ohizumi, Y., Experientia45 (1989) 782.
2. Kobayashi, J., Murayama, T., Ohizumi, Y., Sasaki, T., Ohta, T., and Nozoe, S., Tetrahedron Lett.30 (1989) 4833.
3. Kobayashi, J., Ishibashi, M., Murayama, T., Takamatsu, M., Iwamura, M., Ohizumi, Y., and Sasaki, T., J. org. Chem.55 (1990) 3421.
4. Walker, R. P., Faulkner, D. J., Van Engen, D., and Clardy, J., J. Am. chem. Soc.103 (1981) 6772.
5. Sceptrin(2): a colorless solid; [α] D 22 - 14.5° (c 0.23, MeOH);1H NMR (DMSO-d6) δ 12.2 (brs, H-14), 11.8 (brs, H-1), 11.7 (brs, H-12), 8.18 (brt,J=5.2 Hz, H-7), 7.36 (brs, H-13), 6.98 (dd,J=1.1 and 2.7, Hz H-2), 6.80 (d,J=1.1 Hz, H-4), 6.60 (s, H-15), 3.43 (m, H-8), 2.93 (d,J-8.4 Hz, H-10) and 2.27 (m, H-9);13C NMR (MeOH-d4) δ 163.7 (s, C-6), 149.6 (s, C-13), 129.5 (s, C-11), 128.0 (s, C-5), 123.3 (d, C-2), 111.1 (d, C-4), 108.4 (d, C-15), 98.3 (s, C-3), 45.1 (t, C-8), 43.1 (d, C-10) and 39.7 (d, C-9); FABMS (positive ion),m/z 619 (M++H), 621 (M++2+H), 623 (M++4+H), 541 (M+−Br+H) 543 (M+−Br+2+H). HRFABMSm/z 619.0590 (M++H; calcd for C22H25N10O2Br2, 619.0583).