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Biological screening of traditional medicinal plants from Papua New Guinea.

• Andriopoulos Nick, Topul Rali, Otto Sticher
• Journal of ethnopharmacology
• 1995

Based on ethnopharmacological literature, 17 species of medicinal plants used in the traditional medicine in Papua New Guinea were collected. Extracts of different polarities were tested in a… (More)

Antibacterial triterpenoids from Dillenia papuana and their structure-activity relationships.

• Andriopoulos Nick, Anthony David Wright, Topul Rali, Otto Sticher
• Phytochemistry
• 1995

Two new oleanene-type triterpenoids, dillenic acids D and E, have been isolated from the leaves and stems of Dillenia papuana together with the new natural product 3-oxoolean-12-en-30-oic acid.… (More)

Gibbilimbols A-D, cytotoxic and antibacterial alkenylphenols from Piper gibbilimbum.

• Jimmy Orjala, Peter Mian, Topul Rali, Otto Sticher
• Journal of natural products
• 1998

Fractionation of the petroleum ether extract from the leaves of Piper gibbilimbum collected in Papua New Guinea afforded four new alkenylphenols, gibbilimbols A-D (1-4). The structures of the… (More)

Cytotoxic and antibacterial dihydrochalcones from Piper aduncum.

• Jimmy Orjala, Anthony David Wright, +4 authors Topul Rali
• Journal of natural products
• 1994

Bioactivity-guided fractionation of a CH2Cl2 extract from the leaves of Piper aduncum afforded three new dihydrochalcones, piperaduncins A [3], B [4], and C [5], as well as two known… (More)

Five new prenylated p-hydroxybenzoic acid derivatives with antimicrobial and molluscicidal activity from Piper aduncum leaves.

• Jimmy Orjala, Clemens A. J. Erdelmeier, Anthony David Wright, Topul Rali, Otto Sticher
• Planta medica
• 1993

Five new prenylated benzoic acid derivatives, methyl 3-(3,7-dimethyl-2,6-octadienyl)-4-methoxybenzoate (1), 1-(1-methylethyl)-4-methyl-3-cyclohexenyl 3,5-bis(3-methyl-2-butenyl)-4-hydroxybenzoate… (More)

Antibacterial triterpenoid acids from Dillenia papuana.

• Andriopoulos Nick, Anthony David Wright, Otto Sticher, Topul Rali
• Journal of natural products
• 1994

Three new oleanene-type triterpenoids, dillenic acids A [1], B [2], and C [3], and two known compounds, 3-oxoolean-1,12-dien-30-oic acid [4] (a new natural product) and the lupene derivative… (More)

Acylated flavonol glycosides from leaves of Stenochlaena palustris.

• Huanfa Liu, Jimmy Orjala, Otto Sticher, Topul Rali
• Journal of natural products
• 1999

From the leaves of Stenochlaena palustris five new O-acylated flavonol glycosides, stenopalustrosides A-E (1-5), have been isolated along with five known compounds, kaempferol 3-O-(3'… (More)

Bioactive coumarin derivatives from the fern Cyclosorus interruptus.

• T Quadri-Spinelli, Joerg Heilmann, Topul Rali, Otto Sticher
• Planta medica
• 2000

Three new coumarin derivatives, compounds 1-3, three new furanocoumarins, compounds 4-6, and a novel dioxocane derivative, compound 7, were isolated from the fern Cyclosorus interruptus (Willd.) H.… (More)

Indole alkaloids with in vitro antiproliferative activity from the ammoniacal extract of Nauclea orientalis.

• Clemens A. J. Erdelmeier, Urs Regenass, Topul Rali, Otto Sticher
• Planta medica
• 1992

Nine angustine-type alkaloids were isolated from ammoniacal extracts of Nauclea orientalis L. (Rubiaceae). Three of them, 10-hydroxyangustine and the two diastereoisomeric 3,14-dihydroangustolines,… (More)

Volatile chemical constituents of Piper aduncum L and Piper gibbilimbum C. DC (Piperaceae) from Papua New Guinea.

• Topul Rali, Stewart W Wossa, David N. Leach, Peter G. Waterman
• Molecules
• 2007

Exhaustive hydro-distillation of the leaves of Piper aduncum and fruits of Piper gibbilimbum (Piperaceae) afforded colorless and pale orange colored oils in 0.35 and 0.30 % yields, respectively.… (More)

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