The methanol extract from the stem bark of Drypetes. tessmanniana (Euphorbiaceae) as well as some of the isolated compounds might be potential sources of new antimicrobial drugs.

Condensation of 2-hydroxy-1-naphthalenecarboxylic acid with phloroglucinol afforded 9,11-dihydroxy-12H-benzo[a]xanthen-12-one (6). Construction of an additional dimethylpyran ring onto this skeleton, by alkylation with 3-chloro-3-methyl-1-butyne followed by Claisen rearrangement, gave access to 6-hydroxy-3,3-dimethyl-3H,7H-benzo

The MeOH extract of the stem barks of Drypetes tessmanniana (Euphorbiaceae) afforded two new triterpene derivatives characterized as 3b b-O-(E)-3,5-dihydroxycinnamoyl-11-oxo-olean-12-ene and 3b b,6a a-dihydroxylup-20(29)-ene together with seven known compounds. Their structures were established on the basis of spectral analysis.

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The alkaloids norchelerythrine, magnoflorine and (-)(S)-O-methylbalfourodinium cation were isolated from Zanthoxylum scandens bark collected in Vietnam, together with the flavanone glycoside hesperidin and the phenylpropanoids (E)-O-geranylconiferyl alcohol and (E)-O-geranylconiferyl alcohol (9Z, 12Z)-linoleate. This latter is a novel compound whose structure was elucidated on the basis of its spectral data and confirmed by chemical correlation.