76 (m, 2H), 2.62 (dt, J = 14.0 Hz, J = 2.7 Hz, 1H), 2.17–1.98 (m, 2H). 13C NMR (150 MHz, D2O) δ 173.0, 155.0 (2C) 152.5, 152.3, 147.8, 147.6, 139.4, 138.7, 118.6, 118.3, 88.9, 86.8, 84.9, 81.8, 79.8, 73.8, 71.1, 69.0, 67.6, 60.4, 55.3, 53.9, 5