1H NMR (400 MHz, DMSO-d6) δ
8.26 (d, J = 14.0 Hz, 2H), 7.62 (d, J = 7.4 Hz, 2H), 7.46 (dd, J = 20.3, 7.8 Hz, 4H), 7.28 (t, J = 7.5 Hz, 2H),
6.37(d, J = 14.2 Hz, 2H), 4.22 (t, J = 7.3 Hz, 4H), 3.09 (q, J = 7.4 Hz, 6H), 2.73 (t, J = 6.0 Hz, 4H),
1.95 –1.70 (m, 8H), 1.67 (s, 12H), 1.17 (t, J = 7.3 Hz, 9H).