“…1) , m/z 426) and HREIMS. The IR spectrum displayed strong absorptions at 3400 cm -1 (hydroxyl group) and 1652 cm -1 (carbonyl group), which were characteristic of 5-hydroxy-2-alkylchromone moiety 10,11 and supported by the UV spectrum (λ max at 231 and 327 nm). The structure of 5-hydroxy-2-alkyl-chromone moiety was confirmed by the 1 H NMR spectrum of 2, which contained three mutually coupling protons belong an ABC-type system at δ 6.77 (1H, d, J = 8.2 Hz), 6.86 (1H, dd, J = 8.2, 0.4 Hz) and 7.50 (1H, t, J = 8.2 Hz) corresponding to H-8, 6 and 7, one deshielding olefinic proton at δ 6.11 (1H, s) and a singlet at δ 12.59 (1H, s) ascribable to a chelated hydroxyl group at C-5.…”