7-Dehydrositosterol from Rauwolfia serpentina

7-Dehydrositosterol has been isolated from the roots of Rauwolfia serpentina.     

1,2-dehydroaspidospermidine-N-oxide,an alkaloid from Rhazya stricta

A new alkaloid, 1,2-dehydroaspidospermidme-N-oxide, has been isolated from the roots of Rhazya stricta.     

Foetidin,a sesquiterpenoid coumarin from Ferula assa-foetida

A new sesquiterpenoid coumarin, foetidin, has been isolated from the roots of Ferula assa-foetida.     

Tylophorinicine,a phenanthroindolizidine alkaloid from tylophora asthmatica and pergularia pallida

Tylophorinicine, a minor alkaloid isolated from the roots of Tylophora asthmatica and Pergularia pallida has been characterized as 14-hydroxytylophorine from physical and chemical evidence.     

An oxindole from the roots of Capparis tomentosa

The structure of 3-hydroxy-3-methyl-4-methoxyoxindole isolated from the roots of Capparis tomentosa has been determined by spectrometric methods.     

Amasterol,an ecdysone precursor and a growth inhibitor from Amaranthus viridis

A sterol isolated from the roots of Amaranthus viridis has been assigned the structure 24-methylene-20- hydroxycholest-5,7-en-3β-ol.     

Melovinone,an open chain analogue of melochinone from Melochia tomentosa

Melovinone, a new alkaloid isolated from the roots of Melochia tomentosa has been characterized as 3,7,8-trimethoxy-2-methyl-5(5′-phenylpentyl)-4-quinolinone.     

Novel nor-harmal alkaloid from Adhatoda vasica

A novel alkaloid and a galactoside isolated from the roots of Adhatoda vasica have been characterized as 9-acetamido-3,4-dihydropyrido-(3,4-b)-indole and O-ethyl-α-D-galactoside respectively by chemical and spectroscopic methods. In addition sitosterol β-D-glucoside, D-galactose and deoxyvasicinone have also been isolated from the roots of this plant.     

Ajmalicidine an alkaloid from Rauwolfia serpentina

A new heteroyohimban alkaloid, ajmalicidine, has been isolated from the roots of Rauwolfia serpentina of Thai origin. Its structure has been elucidated as 1-carbomethoxy-17α-hydroxy-16-decarbomethoxy 16,17-dihydro ajmalicine through chemical and spectral studies.     

Iridoid glucosides from clerodendrum incisum

8-O-Foliamenthoyleuphroside and 2′-O,8-O-difoliamenthoyleuphroside, new foliamenthic acid esters of euphroside, and the known iridoid euphroside have been isolated from the leaves and twigs of Clerodendrum incisum. From the roots of the same plant the known iridoid plantarenaloside has been isolated. The taxonomic significance of these findings is discussed.     

Daphneticin,a coumarinolignoid from Daphne tangutica

A new coumarinolignoid, daphneticin, has been isolated from the roots of Daphne tangutica and its structure elucidated on the basis of chemical and NMR spectroscopic evidence.     

A caryophyllene derivative from Fleischmannia pycnocephaloides

A new caryophyllene derivative, 15-acetoxy-5,6-dihydro-6,7-dehydrocaryophyllen-5-one, has been isolated from the roots of Fleischmannia pycnocephaloides. Other Fleischmannia sp. yielded previously known compounds.     

A natural triterpene acid from Hyptis suaveolens

A new natural triterpenoid, characterized as 3β-hydroxylup-20(29)-en-27-oic acid, has been isolated from the roots of Hyptis suaveolens in additi     

Koenoline,a further cytotoxic carbazole alkaloid from Murraya koenigii

Koenoline, a carbazole alkaloid, has been isolated from the root bark of Murraya koenigii for the first time as a natural product. Its structure was established as 1-methoxy-3-hydroxymethylcarbazole by analysis of spectroscopic data and was confirmed by partial synthesis from murrayanine isolated from M. siamensis roots. Koenoline exhibited cytotoxic activity against the KB cell-culture test system.     

Glycozolidol,an antibacterial carbazole alkaloid from Glycosmis pentaphylla

Glycozolidol, a new carbazole alkaloid, has been isolated from the roots of Glycosmis pentaphylla. Its structure has been established as 6-hydroxy-2-methoxy-3-methylcarbazole on the basis of physical and chemical evidence. The compound has been found to be active at some Gram-positive and Gram-negative bacteria.     

Triterpenoids from Hyptis suaveolens roots

A new natural triterpenoid, 3β-hydroxylup-12-en-28-oic acid, has been isolated from the roots of Hyptis suaveolens in addition to α- and β-amyrin.     

Heptazolicine,a carbazole alkaloid from Clausena heptaphylla

A new carbazole alkaloid designated as heptazolicine has been isolated from the roots of Clausena heptaphylla. On the basis of spectral and chemical evidence it has been identified as [2,2-dimethyl-3,4-dihydropyrano-(5, 6-a)]-3-formyl-8-hydroxy-carbazole.     

5α-Stigmast-9(11)-en-3β-ol,a sterol from Costus speciosus roots

A new sterol isolated from Costus species roots has been characterized as 5α-stigmast-9(11)-en-3β-ol by spectroscopic data and chemical studies.     

Peucelinendiol,a new acyclic diterpenoid from Peucedanum oreoselinum

A new diterpenoid has been isolated from roots of Peucedanum oreoselinum. Mainly by spectroscopic methods, its structure is shown to be (+)-(E)-7-hydroxymethyl-2,6,10,14-tetramethyl-2,9,13-pentadecatrien-6-ol, yet without specification of stereochemistry at C-6 and C-7. Furthermore the roots afforded a high yield of falcarindiol, (+)-(Z)-heptadeca-1,9-dien-4,6-diyn-3,8-diol.     

Desangeloylshairidin,a sesquiterpene lactone from Guillonea scabra

From the roots of Guillonea scabra a new sesquiterpene lactone has been isolated. Its structure has been established by spectroscopic means as desangeloylshairidin.