Four diarylpentanoids (1-4), two phenylpropanoids (5-6), three biflavonoids (7-9), two lignans (10-11) and a coumarin (12) were isolated from the roots of Diploniorpha sikokiana (Franchet & Savatier) Honda (Family: Thymelaeaceae). Similarly, two phenylpropanoids (5-6), five biflavonoids (7-9, 13, 14), three lignans (11, 15, 16), a flavonoid (17) and two coumarins (12, 18) were isolated from the stems, and five flavonoids (17, 19-22) from the leaves. Among them, 1,5-diphenyl-l-pentanone (1), 1,5-diphenyl-2-penten-l-one (2), 3(S)-hydroxy-1,5-diphenylpentane (3), stelleranol (8), (-)-syringaresinol (10), (-)-pinoresinol 4,4'-di-O-β-D-glucopyranoside (11), apiosylskimmin (12), syringaresinol 4-O-β-D-glucopyranoside (16), quercetin 3-O-α-L-rhamnopyranoside (19), kaempferol 3-0-α-L-rhamnopyranoside (20) and tiliroside (21) were isolated for the first time from D. sikokiana.
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