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Four new meroterpene derivatives have been isolated in a bioassay-guided study of the methanol extract of the leaves of Psoralea glandulosa, in addition to the known compounds bakuchiol and… (More)
Abstract Extracts from the epicuticular waxes of leaves from Baccharis linearis collected at the same locality at different seasons of the year were compared in terms of relative yields, chemical… (More)
Abstract Three new neo-clerodane diterpenoids were isolated together with other known clerodanes from Baccharis rhomboidalis . Their structures were established by spectroscopic methods.
The antioxidant activity of eight coumarins and two flavonols isolated from Haplopappus multifolius was studied with the DPPH radical method. Results show that a high concentration of phenolic… (More)
A chemical study of a dichloromethane extract of Balantiopsis cancellata led to the isolation of four known 2-phenylethanol esters (1-4) and a phenylethanediol benzoate (5). Antifeedant activity… (More)
Abstract 6β-Angeloyloxytropan-3α-ol, 3α-senecioyloxytropan-6β-ol and 6β-tigloyloxytropan-3α-ol, tropine and two diasteromeric hygrolines were isolated from Schizanthus hookerii .
Abstract Three new tropanol dimers of mesaconic and itaconic acids and 3α-senecioyloxytropane, together with other known alkaloids, were isolated from Schizanthus grahamii . The structures of the new… (More)
Abstract ent -4α-Hydroxy-19-norbeyer-15-ene, ent -beyer-15-en-17,19-diol, apigenin and two new diterpenes, ent -beyer-15-en-18,19-diol and 15β,16β-epoxide- ent -beyeran-18-ol were isolated from… (More)
GC-MS and (1)H NMR spectroscopic profiling of a CDCl 3 extract of the liverwort Riccardia polyclada (syn. R. umbrosa) revealed the presence of four main compounds bearing several chlorine atoms on a… (More)
A bioassay-guided chemical study of a methanolic extract of fresh leaves of Luma chequen led to the isolation of lumaflavanones A (1), B (2) and C (3) whose structures are proposed on the basis of… (More)