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23. [α]D=+35.5 (c=5.4, CHCl3); δH (500 MHz, CDCl3) 5.77 (1H, ddt J 17.1, 10.1, 7.1, CH_CH2), 5.10–5.01 (2×1H, 2×m,
CH_CH2), 4.30 (1H, qd, J 6.5, 1.2Hz, _CHCH2CHN), 3.55 (1H, dtd J 11.2, 7.4, 3.6Hz, NCH), 2.38–2.31 (31×H, 3×m,
CH2CO and _CH-CHH), 2.24 (1H, m, _CH-CHH), 2.16 (1H, dtd, J 12.9, 7.3, 5.4 COCH2CHH), 1.85 and 1.15 (1He,
1Ha, 2×m, CH2) 1.69–1.44(5×1H, 5×m). δC-13(125 MHz, CDCl3) 174.10(C3), 135.59(_CH), 117.38(_CH2), 53.66(C9),
47.71(C5), 35.20(_CHCH2), 34.09(CH2), 30.78(C3), 27.01(CH2), 25.98(C2), 19.21(CH2).
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26. All new compounds gave satisfactory spectroscopic and high resolution mass spectral data.