¹H NMR (400 MHz, CDCl₃) δ 8.19 (d, J = 8.1 Hz, 1H), 7.75 (t, J = 7.2 Hz, 1H), 7.63 (t, J = 7.8 Hz, 1H), 7.41 (d, J = 7.4 Hz, 1H), 7.36 – 7.28 (m, 4H), 7.22 (d, J = 6.8 Hz, 1H), 6.11 (s, 1H), 3.02 (d, J = 10.2 Hz, 1H), 2.71 – 2.55 (m, 2H), 2.54 – 2.40 (m, 2H), 2.22 (d, J = 13.0 Hz, 1H), 1.95 – 1.81 (m, 1H). ¹³C NMR (101 MHz, CDCl₃) δ 205.58, 145.78, 141.62, 137.69, 136.38, 134.33, 130.48, 128.31, 128.02, 126.97, 125.09, 124.58, 122.60, 46.62, 28.17, 27.13, 25.57. HRMS(ESI): calcd for C₁₉H₁₈NO₃ [M + H]: 308.1287, found: 308.1286.