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α]D22 +31 (c, 0.8, CHCl 3, mp 245°C {Lit.8 [α]D22 +32.3; mp 250°C, IR (film, 3291, 2929, 2869, 1655, 1578, 1458, 1287, 1162, 907, 733, 665 cm-1. 1H NMR (400 MHz, CDCl 3, δ, 7.82 (s, 1 H, H-14, 6.75 (s, 1 H, H-11, 5.82 (br s, 1 H, OH, 2.67 (dd, J, 4.4, 18.0 Hz, 1 H, H-6α, 2.58 (dd, J, 13.6, 18.0 Hz, 1 H, H-6β, 2.23 (s, 3 H, ArCH3, 1.83 (dd, J, 4.4, 13.6 Hz, 1 H, H-5, 1.24-1.78 (m, 6 H, 1.20 (s, 3 H, Me-20, 0.98 (s, 3 H, Me-19, 0.92 (s, 3 H, Me-18, 13C NMR (50 MHz, CDCl3, δ, 38.2 (C-1, 19.1 (C-2, 41.5 (C-3, 33.5 (C-4, 49.8 (C-5, 36.2 (C-6, 199.3 (C-7, 124.4 (C-8, 157.3 (C-9, 38.1 (C-10, 109.8 (C-11, 159.7 (C-12, 122.4 (C-13, 131.0 (C-14, 15.4 (ArCH3, 32.8 (C-18, 21.6 (C-19, 23.5 (C-20, HRMS ESI, m/z [M, calcd for C
-
2: 272.1772; found: 272.1776.
-
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21
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0013172047
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