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Induction of apoptosis in human promyelocytic leukemia cell line HL-60 by C-benzylated dihydrochalcones, uvaretin, isouvaretin and diuvaretin.

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Uvaretin, isouvaretin and diuvaretin, cytotoxic C-benzylated dihydrochalcones isolated from Uvaria acuminata, displayed growth inhibitory effects against human promyelocytic leukemia HL-60 cells. We examined the mechanism of the cytotoxicity. From the morphological study by staining with Hoechst

Tonkinelin: a novel annonaceous acetogenin from Uvaria tonkinensis.

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Further studies on the root bark of Uvaria tonkinensis Finet et Gagnep. (Annonacease) led to the isolation of a new Annonaceous acetogenin, tonkinelin (1). The structure of 1 was elucidated on the basis of spectral data and chemical evidence. This compound represents an unusual type of C37

Hydroxyespintanol and schefflerichalcone: two new compounds from Uvaria scheffleri.

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A chemical investigation of the petroleum ether extract and chloroform extract of the root of Uvaria scheffleri Diels (Annonaceae) led to the isolation of two new compounds, named hydroxyespintanol (1) and schefflerichalcone (2), together with eight known compounds (3-10). The structural elucidation

Antitubercular and cytotoxic polyoxygenated cyclohexane derivatives from Uvaria grandiflora.

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Chromatographic purification of the DCM sub-extract of Uvaria grandiflora led to the isolation and characterization of a new polyoxygenated cyclohexane derivative, grandifloranol (1), together with five known compounds. Among the compounds isolated, zeylenone (3) showed moderate

Chemical studies on the roots of Uvaria welwitschii.

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A chemical investigation of the chloroform extract of the roots of Uvaria welwitschii (Annonaceae), an African traditional medicine taken for stomach ache, led to the isolation of eight new compounds, named welwitschins A-H (1-8), together with five known compounds (9-13). The structural elucidation

Pyrenes and pyrendiones from Uvaria lucida.

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A chemical investigation of the chloroform extract of the roots of Uvaria ludida Benth. (Annonaceae), an important African traditional medicine, led to the isolation of six new compounds; three pyrenes, 2-hydroxy-1,8-dimethoxypyrene (1), 8-methoxy-1,2-methylenedioxypyrene (2), and

Cytotoxic C-benzylated dihydrochalcones from Uvaria acuminata.

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Two new C-benzylated dihydrochalcones, isochamuvaritin (1) and acumitin (2), have been isolated from the African medicinal plant Uvaria acuminata, together with the previously reported benzylbenzoate (3), uvaretin (4), isouvaretin (5), diuvaretin (6), and uvangoletin (7). The structural elucidation

Tetrahydroxanthene-1,3(2H)-dione derivatives from Uvaria valderramensis.

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Two tetrahydroxanthene-1,3(2H)-dione metabolites, valderramenols A (1) and B (2), were isolated from the Philippine endemic Annonaceous species Uvaria valderramensis. Planar structures of the rac-xanthene-1,3-(2H)-diones 1 and 2 were established by MS and NMR measurements. Their enantiomers were

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