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Compound 6: [α]D25 +15.8 (c 1.0, CHCl3, 1H NMR (300 MHz, CDCl3, δ, 1.41, 1.37, 1.34, 1.32 (4 s, 12 H, 3.90-4.20 (m, 5 H, 4.25 (d, J, 4.6 Hz, 1 H, 7.3 (m, 5 H, 13C NMR (75 MHz, CDCl3, δ, 25.1, 26.3, 26.6, 27.1, 72.6, 75.4, 76.7, 82.6, 83.6, 109.0, 110.0, 126.8, 127.74, 128.5, 140.0. IR (KBr, vmax, 3438, 2990, 2874, 1376, 1153, 1070, 843, 702 cm-1. HRMS: m/z calcd for C17H 24O5 [M, Na, 331.1521; found: 331.1512. Compound 8: [α]D25 +67.6 (c 0.5, CHCl3, 1H NMR (300 MHz, CDCl3, δ, 1.41, 1.37, 1.34, 1.32 (4 s, 12 H, 3.23 (s, 3 H, 3.94-4.15 (m, 5 H, 4.25 (d, J, 4.5 Hz, 1 H, 7.13 (m, 5 H, 13C NMR 75 MHz, CDCl 3, δ, 25.1, 26.3, 26.5, 27.2, 56.4, 72.3, 75.4, 76.6, 82.5
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+: 271.0946; found: 271.0945.
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