¹H NMR (400 MHz, CDCl₃) δ 7.94 (d, J = 8.2 Hz, 1H), 7.89 (d, J = 7.8 Hz, 1H), 7.68 (m, 1H), 7.46 (d, J = 7.8 Hz, 1H), 7.41 (d, J = 7.5 Hz, 2H), 7.34 (d, J = 7.2 Hz, 2H), 7.28 (d, J = 6.7 Hz, 1H), 6.20 (s, 1H), 5.22 (d, J = 10.2 Hz, 1H), 4.54 (q, J = 17.5 Hz, 2H), 2.97 (d, J = 16.4 Hz, 1H), 2.66 - 2.54 (m, 1H). ¹³C NMR (100 MHz, CDCl₃) δ 147.8, 139.8, 137.9, 134.5, 133.6, 128.5, 128.3, 128.2, 127.5, 124.9, 124.2, 121.9, 71.8, 67.0, 34.4. HRMS (ESI): calcd for C₁₇H₁₅NNaO₃⁺: 304.0944, found: 304.0949.