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Steroids and polyketides from Uvaria hamiltonii stem bark.
Two known steroids, stigmasterol and 6b-hydroxystigmasta-4,22-dien-3-one (1) and two unusual polyketides, cis-4-hydroxymellein (2) and trans-4-hydroxymellein (3) were isolated from the stem bark of… Expand
Chemical constituents of Glycosmis arborea: three new carbazole alkaloids and their biological activity.
As part of the phytochemical studies of the plant genus Glycosmis, the constituents of the plant Glycosmis arborea were investigated. Three new carbazole alkaloids named glybomines A (1), B (2), and… Expand
Haligramides A and B, two new cytotoxic hexapeptides from the marine sponge Haliclona nigra.
Bioassay-guided fractionation of a cytotoxic aqueous extract of the sponge Haliclona nigra provided two new cyclic hexapeptides, haligramides A (1) and B (2), in addition to the known peptide,… Expand
Phytochemical screening and comparative antimicrobial potential of different extracts of Stevia rebaudiana Bertoni leaves
Abstract Objective To evaluate in vitro antimicrobial potential and phytochemical screening of the crude extracts of leaves of Stevia rebaudiana Bertoni. Methods The essential oil and crude extracts… Expand
Chemical and biological studies of Kalanchoe pinnata (Lam.) growing in Bangladesh
Abstract Objective To isolate compounds from K. pinnata and elucidate their structures and to explore preliminary antioxidant, antimicrobial, cytotoxic and thombolytic activities of extractives of… Expand
Antibacterial activity of Barringtonia racemosa.
The antibacterial activity of the ethanol extract of Barringtonia racemosa roots, its chloroform soluble fraction and, a there from an isolated clerodane diterpenoid is reported.
HIV-inhibitory cembrane derivatives from a Philippines collection of the soft coral Lobophytum species.
Bioassay-guided fractionation of an aqueous extract of a Philippine Islands collection of the soft coralLobophytum sp. concentrated its HIV-inhibitory activity into fractions rich in cembranoid… Expand
HIV-inhibitory diterpenoid from Anisomeles indica.
The 1H- and 13C-NMR spectral data of ovatodiolide (1), a diterpenoid from Anisomeles indica, and its anti-HIV activity are reported.
Anti-HIV Alkaloids from Toddalia asiatica
Abstract Bioassay-directed fractionation of a Toddalia asiatica (Rutaceae) extract concentrated anti-HIV activity into fractions rich in quaternary alkaloids. Nitidine (1), a benzo[c]phenanthridine… Expand
Secondary Metabolites from Seed Extracts of Syzygium Cumini (L.)
Four compounds were isolated from the pet-ether and carbon tetrachloride soluble fractions of a methanol extract of seeds of Syzygium cumini. The structures of the isolated compounds were elucidated… Expand