White crystalline needles; m. p. 210±2128C; [a]D 25: + 298 (c 0.41, CHCl3); IR (CHCl3): nmax = 3514 to 2800 (COOH), 1731 (COOH), 1695 (CO), 1457 cm-1 (C = C). EI :m/z (rel. int.) = 454 [M+, C30H46O3] (13), 410 (53), 408 (9), 248 (33), 235 (87), 191 (97), 189 (95), 163 (30), 119 (35), 95 (39), 69 (30). 1H-NMR (CDCl3, 300 MHz): d = 12.00 ± 10.00 (1H, COOH), 5.16 (1H, s, H-19), 2.47 (2H, m, H-2), 2.27 ± 2.04 (m), 1.98 (2H, m, H-1), 1.70 ± 1.20 (CH and CH2), 1.08, 1.03, 1.02, 1.00, 0.97, 0.94, 0.79 (21H, 7 s, 7CH3). 13C-NMR (CDCl3, 75 MHz, multiplicities by the DEPT pulse sequences): d = 218.2 (s, C-3), 182.3 (s, C-28), 136.5 (s, C-18), 133.2 (d, C-19), 54.8 (d, C-5), 50.4 (d, C-9), 47.9 (s, C-17), 47.2 (s, C-4), 42.5 (s, C-14), 41.4 (d, C-13), 40.5 (s, C-8), 39.8 (t, C-1), 36.9 (s, C-10), 34.0 (t, C-7), 33.8 (t, C-2), 33.5 (t, C-22), 33.4 (t, C-21), 33.3 (t, C-16), 32.0 (s, C-20), 30.3 (q, C-29), 29.3 (t, C-15), 29.0 (q, C-30), 26.8 (q, C-24), 26.0 (t, C-12), 21.4 (t, C-11), 20.9 (q, C-23), 19.6 (t, C6), 16.4 (q, C-26), 15.8 (q, C-25), 14.8 (q, C-27).