Fig. 3

HPLC chromatograms of authentic phenylbutenoids (A) and PE (B); 1: (E)-1-(3,4-dimethoxyphenyl)but-3-en-1-ol (compound D), 2: (E)-1-(3,4-dimethoxyphenyl)but-3-en-1-yl acetate (compound D acetate), and 3: (E)-(3,4-dimethoxyphenyl)butadiene (DMPBD)