1H NMR (400 MHz, CDCl3) δ: 8.31 (d, J = 8.6 Hz, 2H), 8.12 (d, J = 8.6 Hz, 2H), 4.43 – 4.37 (m, 1H), 3.90 – 3.87 (dd, J= 14.8, 7.1 Hz, 1H), 3.77 – 3.75 (dd, J = 14.9, 7.4 Hz, 1H), 3.42 – 3.36 (dd, J = 16.2, 6.7 Hz, 1H), 3.13 – 3.04 (dd, J = 16.2, 5.8 Hz, 1H), 2.24 – 2.18 (td, J = 12.8, 6.5 Hz, 1H), 1.99 – 1.92 (m, 2H), 1.62 – 1.57 (m, 1H). 13C NMR (100 MHz, CDCl3) δ: 25.6, 31.6, 45.1, 68.0, 75.1, 123.8, 129.3, 141.5, 150.3, 197.1. HRMS (EI) Calcd for C12H13NO4 (M+) 235.0845; Found, 235.0840.
