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1H NMR (400 MHz, CDCl3) δ 7.45 – 7.13 (m, 4H), 5.36 (d, J = 54.7 Hz, 2H), 2.73 (s, 2H), 1.26 (s, 6H). 13C{1H} NMR (101 MHz, CDCl3) δ 142.79, 139.92, 133.60, 128.58, 127.71, 124.37, 119.05, 45.32, 32.97, 27.01. GC-MS (m/z) = 219.