Compound (-)-6: IR (neat, cm-1): 1712 (C=O), 1640 (C=C) cm-1: lH NMR (400. MHz, CDCl3): δ 4.75 (m, 2H), 2.36~2.40 (m, 2H), 2.18 (ddd, J = 12.0, 10.8, ...
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