¹³C NMR (176 MHz, CDCl₃) δ 166.00 (s, 1C), 139.33 (s, 1C), 134.62 (s, 1C), 132.24 (s, 1C), 130.47 (s, 1C), 128.98 (s, 1C), 127.68 (s, 1C), 127.19 (s, 1C), 123.33 (s, 1C), 122.82 (s, 1C), 118.87 (s, 1C).