Naringenin 4 4 12.0 7.0 6.5 6.0 5.5 3.5 3.0 219 5.43 dd J=2.8, 12.7Hz H-2 3.26 dd J=12.7, 17.1Hz H-3ax 2.69 dd J=2.8, 17.1Hz H-3eq 12.15 s 5.90 s 7.32 d H-6, -8 J=8.5Hz H-2', 6' 6.81 d J=8.5Hz H-3', 5' Naringenin 2 6 4 3 8 4' 1' O OH O HO OH Heq Hax H 220 OH-5’ 2 3 6 8 O O OH OH OCH3 H3CO OH 2 3 221 O O OH OH OCH3 H3CO OH 2 3 222 3 7 5 4' 1' 8 6 4 2 1 O OH O OH 13.0 12.5 8.0 7.5 7.0 6.5 12.82 s OH-5 7.96 d J=8.7Hz H-2', 6' 7.65 t J=8.3Hz H-7 7.13 d J=8.3Hz H-8 6.97 d J=8.7Hz H-3', 5' 6.90 s H-3 6.79 d J=8.3Hz H-6 5, 4'-Dihydroxyflavone 223 O O OCH3 OH H3CO OH 3 2 224 H-2, d 5.33 (dd) J=12.9, 2.9 Hz H-3a, d 3.08 (dd) J=12.9, 17.1 Hz H-3b, d 2.79 (dd) J=2.9, 17.1 Hz O O OCH3 OH H3CO OH 3 2