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Analytical Data Compound 3b: IR (neat, 3428, 2904, 1734, 1654, 1499, 1461, 1370, 1215, 1046, 994, 931 cm-1. 1H NMR (300 MHz, CDCl3, 293 K, δ, 6.54 (s, 1 H, 6.26 (br s, 1 H, 5.96 (d, J, 1.1 Hz, 1 H, 5.91 (d, J, 1.1 Hz, 1 H, 5.12 (s, 1 H, 5.05 (s, 2 H, 4.23 (dq, J, 10.2, 7.2 Hz, 1 H, 4.18 (dq, J, 10.2, 7.2 Hz, 1 H, 3.49 (s, 3 H, 1.43 (t, J, 7.2 Hz, 3 H) ppm. 13C NMR (75 MHz, CDCl3, 293 K, δ, 173.0, 142.3, 141.5, 134.4, 132.3, 110.7, 108.3, 102.1, 97.6, 68.3, 62.2, 56.5, 14.0 ppm. HRMS (ESI, m/z [M, Na, calcd for C 13H16O8: 323.0743; found: 323.0745. Compound 3c: IR (neat, 3386, 2930, 2857, 1731, 1482, 1335, 1251, 1126, 1006 cm-1. 1H NMR (300 MHz, CDCl3, 293 K, δ (mixture of two diastereomers, 6.89 (2 s, 1 H, 6.55 (s, 1 H, 5.18 d, J
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3, 293 K): δ = 7.63 (br s, 1 H), 6.77 (d, J = 8.2 Hz, 1 H), 6.71 (d, J = 8.2 Hz, 1 H), 5.72 (br s, 1 H), 5.30 (s, 1 H), 4.33 (dq, J = 10.7, 7.1 Hz, 1 H), 4.24 (dq, J = 10.7, 7.1 Hz, 1 H), 3.39 (br s, 1 H), 3.27 (hept, J = 7.0 Hz, 1 H), 1.29 (t, J = 7.1 Hz, 3 H), 1.24 (t, J = 7.0 Hz, 3 H), 1.23 (t, J = 7.0 Hz, 3 H) ppm.
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We thank one of the referees for bringing up this important point
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We thank one of the referees for bringing up this important point.
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