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The title compound [systematic name: ( E )-1-(2-hydroxy-4,6-dimethoxyphenyl)-3-phenylprop-2-en-1-one],  C 17 H 16 O 4 , has an aromatic ring at both ends of the –CH= CH–C(=O)– fragment with the –CH=CH– bond in a  trans  configuration. The phenyl ring is nearly coplanar with this fragment [dihedral angle 4.8 (3) °] as is the hy­droxy­ldimeth­oxy­lphenyl unit [dihedral angle 6.3 (3) °]. The hy­droxy group is the donor in an intra­molecular hydrogen bond to the double-bonded O atom.

Flavokavain B from the rhizome ofAlpinia muticaRoxb