H. Calcd, 0, CHCl 3 ) Element: Carbon Hydrogen Calcd, pp.70-55

1. Hz and J. =. Ch-dd, 78 (s, 3H, OCH 3 ), 3.64-3.67 (m, 2H, CH 2 -1), 3.50- 3.54 (m, 2H, CH 2 -14), 2.75 (d, J = 5, ), 1.53-1.89 (m, 8H, CH-2, CH 2 -8, pp.8280-8283

J. =. Dd, CHPh(PMB)), 3.98-4.08 (m, 2H, CH-7, CH-9), 3.82-3, 400 MHz) 9.82 (t, J = 1.4 Hz)), 5.48 (s, 1H, C HPh), 4.52 (d, J = 10.7 Hz, 1H, C HPh(PMB)), 4.49 (d, J = 10.8 Hz CH-1), 3.63 (dd, J = 9.6, 3.2 Hz, 1H, CH-1), 3.27 (dd, J = 8.7, 2.3 Hz, pp.0-89

1. Hz and C. , CH-3), 2.66 (dt, J = 7.1, 5.8 Hz, 2H, CH 2 -13), 2.17 (s, 3H, CH 3 -15, pp.77-78

1. Hz and C. , CH-5), 3.76 (s, 3H, OCH 3, pp.80-82

. Mhz, (C-ar), 100, pp.36-39

. Mhz, C- 23), 79.1, 74.4 (C-21b, C -19b), 75.8, 71.0 (C-21a, C -19a), 21.3 (NC(CH 3 ) 2 b), 20.0 (NC(CH 3 ) 2 a) (m, 5H, H-ar), 4.52 (s, 2H, CH 2 Ph), pp.775071-775073

1. Hz and C. , 72 (s, 3H, OCH 3 ), 3.52 (t, J = 6.1 Hz, 2H, CH 2 - 16), 3.28 (d, J = 3.9 Hz, pp.69-70

1. Hz and C. , 67 (s, 3H, OCH 3 ), 3.48 (dt, J = 6, Hz, 2H, CH 2 -16), 2.49 (dd, J = 14.6, 7.2 Hz, 1H, CH-20), p.43

1. Hz and C. , 1.63-1.68 (m, 2H, CH 2 -18), 1.58-1.61 (m, 2H, CH 2 -17), 0

1. Hz and C. , 83-3.89 (m, 1H, CH-19), 3.47-3.51 (m, 2H, CH 2 - 16), 2.92 (bs, pp.4650-4668

. Mhz, (C-ar), 100, pp.26-28