Table 1 Spectral data of isolated compound, aloin A

IR (KBr, cm⁻¹)

3436, 2923, 1684, 1384

¹H NMR (CD₃OD)

δ 7.47 (1H, t, J = 8.0 Hz, H-6), 7.03 (1H, s, H-4), 7.02 (1H, d, J = 8.8 Hz, H-5), 6.86 (1H, s, H-2), 6.83 (1H, t, J = 8.0, H-7), 4.64 (2H, d, J = 3.6 Hz, 3-CH₂-OH), 4.56 (1H, s, H-10), 3.38 (1H, dd, J = 9.2, 2.0 Hz, H-1′), 3.01 (1H, t, J = 9.2, H- 2′), 3.23 (1H, t, J = 8.8 Hz, H-3′), 2.89 (1H, t, J = 8.8 Hz, H-4′), 2.91 (1H, m, H-5′), 3.54 (1H, dd, J = 1.6, 11.6 Hz, H-6′), 3.40 (1H, dd, J = 4.0, 9.6 Hz, H-6)

¹³C NMR (CD₃OD)

δ 163.4 (C-1), 114.5 (C-2), 151.5 (C-3), 64.6 (3-CH₂-OH), 119.2 (C-4), 119.9 (C-5), 137.0 (C-6), 116.8 (C-7), 162.9 (C-8), 195.6 (C-9), 45.9 (C-10), 117.7 (C-1a), 143.3 (C-4a), 146.6 (C-5a), 118.7 (C-8a), 86.7 (C-1′), 71.9 (C-2′), 80.0 (C-3′), 72.1 (C-4′), 81.7 (C-5′), 63.3 (C-6′)