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1
l 6.19 (d, JHH=3.3 Hz, 1H, H-1), 5.18 (ddd, JHH=11.2
Hz, JHH=5.9 Hz, JHH=3.3 Hz, 1H, H-2), 4.10 (dq,
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2.6 Hz, JHH=2.6 Hz, JHH=1.9 Hz, 1H, H-4), 2.1–2.2 (m,
2H, H-3), 2.12 (s, 3H, CH3CO2), 2.01 (s, 3H, CH3CO2),
1.24 (d, JHH=6.5 Hz, 3H, H-6); 13C NMR (68 MHz,
CDCl3): l 169.08 (s), 169.02 (s), 89.4 (s), 67.7 (s), 64.5 (s),
1
61.0 (s), 28.5 (s), 21.1 (s), 20.8 (s), 17.3 (s). 20: H NMR
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4.95 (ddd, JHH=12.2 Hz, JHH=5.0 Hz, JHH=3.3 Hz,
1H, H-2), 3.67 (dq, JHH=10.0 Hz, JHH=6.3 Hz, 1H,
H-5), 3.18 (ddd, JHH=12.2 Hz, JHH=10.0 Hz, JHH=4.6
Hz, 1H, H-4), 2.29 (ddd, JHH=12.2 Hz, JHH=5.0 Hz,
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3H, CH3CO2), 1.94 (ddd, JHH=12.2 Hz, JHH=12.2 Hz,
J
HH=12.2 Hz, 1H, H-3ax), 1.26 (d, JHH=6.3 Hz, 3H,
H-6); 13C NMR (68 MHz, CDCl3): l 169.9 (s), 169.3 (s),
88.5 (s), 69.4 (s), 67.1 (s), 60.7 (s), 29.1 (s), 21.1 (s), 20.8
(s), 18.1 (s).
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