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Compound 15: [α]D +7.5 (c, 1, CDCl 3, 1H NMR (300 MHz, CDCl3, δ, 6.95 (dd, J, 15.8, 4.5 Hz, 1 H, 6.00 (d, J, 15.8 Hz, 1 H, 4.25 (dd, J, 6.7, 4.5 Hz, 1 H, 3.75-3.85 (m, 1 H, 3.72 (s, 3 H, 1.15 (d, J, 6.7 Hz, 3 H, 0.95 (s, 9 H, 0.10 (s, 3 H, 0.06 (s, 3 H, 13C NMR (50 MHz, CDCl3, δ, 166.4, 147.4, 121.6, 75.6, 70.2, 51.3, 25.6, 18.0, 4.6. IR (Neat, 3452, 2928, 2885, 1714, 1642, 1412, 1225, 915 cm-1. MS (ESI, mlz, 297 [M, Na, HRMS: m/z calcd for C13H26O 4SiNa: 297.1498; found: 297.1491. Compound 21: [α] D +7.5 (c, 0.6, CDCl3, 1H NMR (300 MHz, CDCl3, δ, 7.22-7.35 (m, 5 H, 6.90 (dd, J, 15.6, 6.2 Hz, 1 H, 5.95 (d, J, 15.6 Hz, 1 H, 4.50-4.62 (m, 2 H, 4.45 d, J, 6.6 Hz, 2 H
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+ + Na].
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