¹³C NMR (176 MHz, CDCl₃) δ 173.14 (s, 1C), 154.88 (s, 1C), 148.33 (s, 1C), 138.56 (s, 1C), 136.58 (s, 1C), 134.45 (s, 1C), 128.08 (s, 1C), 127.56 (s, 1C), 121.79 (s, 1C), 121.72 (s, 1C), 116.67 (s, 1C), 79.79 (s, 1C), 44.87 (s, 1C), 43.82 (s, 1C), 43.09 (s, 1C), 28.85 (s, 1C), 28.59 (s, 1C).