1H NMR (400 MHz, CDCl3) δ 8.57 (s, 1H), 7.67 - 7.70 (m, 1H), 7.26 (d, J = 4.0 Hz, 1H), 7.23 - 7.15 (m, 1H), 6.83 (d, J= 15.6, 1H), 6.70 (d, J = 15.6, 1H), 1.58 (s, 6H). 13C{1H} NMR (101 MHz, CDCl3) δ 153.8, 149.5, 137.0, 135.0, 129.1, 123.2, 122.9, 122.8, 35.0, 27.5. HRMS (ESI) m/z calcd for C11H12N2Na+ [M+Na]+: 195.0893, found 195.0899.