¹³C NMR (176 MHz, CDCl₃) δ 177.59 (s, 1C), 143.64 (s, 1C), 128.80 (s, 1C), 127.37 (s, 1C), 126.16 (s, 1C), 48.59 (s, 1C), 38.72 (s, 1C), 27.69 (s, 1C), 21.85 (s, 1C).