“…H NMR (400 MHz, D 2 O): δ = 1.05 (t, 3H, J = 7.2 Hz, H-1), 2.67 (m, 2H, H-2), 3.64 (dd, 1H, J = 7.1 and 11 4. Hz, H-6a), 3.72 (dd, 1H, J = 5.8 and 11.4 Hz, H6b), 4.16 (m, 1H, H-5), 4.41 (d, J = 2.1 Hz, H-4);13 C NMR (101 MHz, D 2 O): δ = 6.7 (C-1), 31.9 (C-2), 62.2 (C-6), 71.7 (C5), 76.7 (C-4), 215.7 (C-3); β furanose anomer: 1 H NMR (400 MHz, D 2 O): δ = 0.96 (t, 3H, J = 7.5 Hz, H-1), 1.76 (m, 2H, H-2), 3.60 (dd, 1H, J = 4.8 and 9.7 Hz, H-6a), 3.90 (d, 1H, J = 5.4 Hz, H-4), 4.16 (m, 1H, H-6b), 4.34 (ddd, 1H, J = 5.4 and 10.9 Hz, H-5); 13 C NMR (101 MHz, D 2 O): δ = 6.9 (C1), 30.1 (C-2), 69.4 (C-6), 75.2 (C-5), 78.8 (C-4), 104.5 (C-3); α-furanose anomer: 1 H NMR (400 MHz, D 2 O): δ = 0.99 (t, 3H, J = 7.6 Hz, H-1), 1.76 (m, 2H, H-2), 3.86 (dd, 1H, J = 6.3 and 12.9 Hz, H-6a), 3.99 (d, 1H, J = 1.0 Hz, H-4), 4.24 (m, 2H, H-5 and H-6b); 13 C NMR (101 MHz, D 2 O): δ = 7.2 (C-1), 26.8 (C-2), 72.0 (C-6), 76.3 (C-5), 79.6 (C-4), 108.2 (C-3); m/z HRMS ESI-MS calcd for C 6 H 13 O 4 : 149.0808; found [M + H] + : 149.0807.…”