“…1 H NMR (400 MHz, CDCl 3 ) δ 7.94–7.89 (d, J = 9.0 Hz, 1H), 7.89–7.84 (d, J = 8.3 Hz, 1H), 7.84–7.80 (d, J = 8.1 Hz, 1H), 7.69–7.64 (t, J = 1.5 Hz, 1H), 7.48–7.42 (td, J = 6.8, 1.5 Hz, 1H), 7.40–7.33 (td, J = 6.8, 1.2 Hz, 2H), 6.65–6.62 (d, J = 1.5 Hz, 2H), 3.94 (s, 3H). 24 …”