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- The spectral data of 2: m.p. 44–45 °C; IR (neat) 1660 cm−1; 1H NMR (400 MHz, CDCl3) δ 1.01 (d, J=6.2 Hz, 6H), 1.14 (d, J=6.4 Hz, 6H), 3.10–3.13 (m, 1H), 3.39 (like d, J=7.4 Hz, 1H), 3.90–4.10 (m, 1H), 7.07 (s, 1H), 7.20–7.41 (m, 10H)