¹³C NMR (176 MHz, CDCl₃) δ 163.37 (s, 1C), 150.38 (s, 1C), 148.06 (s, 1C), 137.45 (s, 1C), 126.09 (s, 1C), 122.34 (s, 1C), 48.27 (s, 1C), 33.20 (s, 1C), 25.73 (s, 1C), 25.00 (s, 1C).