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4b: 1H NMR (500 MHz, CDCl3): δ = 0.71 (s, 3 H), 0.71-0.82 (m, 2 H), 0.92-1.00 (m, 1 H), 1.11 (s, 3 H), 1.36-1.42 (m, 1 H), 1.53-1.59 (m, 2 H), 1.83 (d, broad, J = 13.8 Hz, 1 H), 2.05 (s, 6 H), 2.11 (dd, J = 13.8/5.0 Hz, 1 H), 2.20 (s, 6 H), 2.26 (d, J = 15.0 Hz, 1 H), 4.25 (t, J = 7.5 Hz, 1 H), 6.72 (s, 1 H), 6.84 (s, 1 H), 6.94-7.51 (m, 14 H); 31P NMR (202 MHz, CDCl3): δ = -23.9 (s), 112.9 (s).
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