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- Selected spectroscopic data: 1b, 1H NMR, δ, 6.61 (d, J = 16.1 Hz, 1H), 7.20–7.95 (m, 13H); MS, m/z 274 (M+), 131 (base peak). 1h, 1H NMR, δ, 1.20 (t, J = 7.6 Hz, 3H), 2.41 (m, 2H), 4.52 (t, J = 7.8 Hz, 1H), 7.20–8.10 (m, 7H); MS, m/z, 292 (M+), 294 (M+2)+, 144 (base peak). li, 1H NMR, δ, 0.98 (t, J = 8.1 Hz, 3H), 1.41–1.82 (m, 2H), 3.10–3.71 (m, 3H), 5.22 (s, 1H), 6.80–7.59 (m, 7H)