dH (400 MHz, DMSO-d6) 12.81 (1H, br s, COOH), 8.44 (1H, d, J 7.84, NaH), 8.12 (1H, d, J 8.56, NbH), 7.84-7.82 (2H, m, HAr), 7.72 (1H, d, J 8.12, HAr), 7.48-7.44 (1H, m, HAr), 7.38-7.34 (1H, m, HAr), 7.26-7.13 (12H, m, HAr), 4.64 (1H, dt, J 9.08, 4.16, CbH*), 4.53 (2H, s, OCH2), 4.50-4.44 (1H, m, CaH*), 3.07 (1H, dd, J 14.02, 5.34, PhCH’H”CaH*), 3.02 (1H, dd, J 14.16, 4.40, PhCH’H”CbH*), 2.92 (1H, dd, J 13.92, 8.76, PhCH’H”CaH*), 2.85 (1H, dd, J 13.82, 9.62, PhCH’H”CbH*).
dC (100 MHz, DMSO-d6) 172.76, 170.88, and 167.24 (C=O), 155.51, 137.54, 137.38, 134.05, 129.38, 129.28, 129.15, 128.77, 128.21, 128.00, 127.53, 126.82, 126.48, 126.45, 126.28, 123.88, 118.48, and 107.34 (CAr), 66.70 (OCH2), 53.53 (CaH*), 53.26 (CbH*), 37.45 (PhCH2CaH*), 36.71 (PhCH2CbH*).
HRMS (ESI) m/z: [M+Na]+ calcd for C30H28N2NaO5 519.1890; found 519.1907.