长沙资材科技有限公司

¹H NMR (400 MHz, CDCl₃) δ 9.73 (s, 1H), 7.42 (d, J = 7.1 Hz, 1H), 7.35 – 7.24 (m, 2H), 7.22 – 7.15 (m, 1H), 6.49 (s, 1H), 6.43 (s, 1H). ¹³C NMR (101 MHz, CDCl₃) δ 191.52, 148.03, 136.64, 133.81, 132.97, 131.00, 129.86, 129.65, 126.76.