title: New 3-O-acyl betulinic acids from Strychnos vanprukii Craib.
abstract: Three new betulinic acid derivatives, 3beta-O-trans-feruloylbetulinic acid (1), 3beta-O-cis-feruloylbetulinic acid (2), and 3beta-O-cis-coumaroylbetulinic acid (4), along with two known triterpenes, 3beta-O-trans-coumaroylbetulinic acid (3) and ursolic acid (6) were isolated from the leaves and twigs of Strychnos vanprukiiCraib. All isolates showed moderate anti-HIV activity with IC50 values ranging from 3 to 7 microg/mL (5 to 15 microM) in an indicator cell line for HIV infectivity. The structures of the new isolates were elucidated by spectroscopic techniques including 1D and 2D NMR spectroscopy. In addition, the structure of 1 was confirmed by X-ray crystallography.
authors.affiliation: Institute of Chemistry, National Center for Science and Technology, Nghia Do, Tu Liem, Hanoi, Vietnam.
authors.forename: Quyet Chien
authors.initials: QC
authors.lastname: Nguyen
authors.forename: Van Hung
authors.initials: VH
authors.lastname: Nguyen
authors.forename: Bernard D
authors.initials: BD
authors.lastname: Santarsiero
authors.forename: Andrew D
authors.initials: AD
authors.lastname: Mesecar
authors.forename: Manh Cuon
authors.initials: MC
authors.lastname: Nguyen
authors.forename: D Doel
authors.initials: DD
authors.lastname: Soejarto
authors.forename: John M
authors.initials: JM
authors.lastname: Pezzuto
authors.forename: Harry H S
authors.initials: HH
authors.lastname: Fong
authors.forename: Ghee T
authors.initials: GT
authors.lastname: Tan
mesh_terms: D019380:Anti-HIV Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D018360:Crystallography, X-Ray; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D020128:Inhibitory Concentration 50; D015394:Molecular Structure; D053978:Pentacyclic Triterpenes; D018515:Plant Leaves / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D013237:Stereoisomerism; D031451:Strychnos / Q000737:chemistry*; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D014407:Tumor Cells, Cultured; D000094062:Betulinic Acid
chemical_list: D019380:Anti-HIV Agents; D000972:Antineoplastic Agents, Phytogenic; D053978:Pentacyclic Triterpenes; D014315:Triterpenes; D000094062:Betulinic Acid