3α-Angeloyloxy-2α-hydroxycativic acid,a new diterpene from Brickellia paniculata

The investigation of Brickellia paniculata resulted in the isolation of a new diterpene of the labdane type. It was identified as 3α-angeloyloxy-     

A kolavane derivative from Liatris scariosa

A new kolavane derivative, 18-acetoxy-kolav-3-en-15-oic acid, has been isolated from Liatris scariosa.     

Tomexanthin,an oxepane diterpene from montanoa tomentosa

Chemical analysis of Montanoa tomentosa yielded an oxepane diterpene, tomexanthin, which was characterized by spectral comparison with the previously established zoapatanol.     

Poilaneic acid,a cembranoid diterpene from Croton poilanei

Poilaneic acid, a cembranoid diterpene from Croton poilanei, has been characterized as (1R*,2E,4Z,7E, 11Z)-12-carboxyl-1-isopropyl-4,8-dimethylcyclotetradecatetraene.     

A diterpene with a new carbon skeleton from Solidago altissima

An Indian sample of Solidago altissima afforded in addition to several clerodanes already isolated from other Solidago species, a diterpene with a new carbon skeleton. Furthermore a ketone and a new anethole derivative were present.     

Structure of terminic acid,a dihydroxytriterpene carboxylic acid from Terminalia arjuna

The structure of terminic acid, a new dihydroxytriterpene carboxylic acid isolated from the roots of Terminalia arjuna, has been established as 3β, 13β-dihydroxylup-20(29)-en-28-oic acid by a study of its chemical reactions and spectroscopic data. Terminic acid and its derivatives were found to undergo skeletal rearrangement under protonic conditions to yield oleanene lactone.     

15-oxo-zoapatlin,a diterpene lactone from Viguiera maculata

The isolation of a new diterpene lactone and two known diterpenoid acids from the aerial parts of Viguiera maculata is reported.     

Bisabolene derivatives from Stevia salicifolia

The aerial parts of Stevia salicifolia afforded two new bisabolene type sesquiterpenes. The structures were elucidated by spectroscopic, chemical transformations and correlation with 15-acetoxy bisabol-1-one.     

Isolation and structure of stephalic acid,a new clerodane diterpene from Stevia polycephala

From the methanolic extract of Stevia polycephala a new clerodane-type diterpene, stephalic acid, was isolated. The structure and stereochemistry were determined by a combination of spectral data and single-crystal X-ray analysis.     

Sesquiterpene and diterpene derivatives from Solidago species

The investigation of four Solidago species afforded, in addition to known compounds, four new caryophyllene derivatives, two eudesmanes, two abietanes, a clerodane, two labdanes, three kauranes and an anol angelate. The structures were elucidated by spectroscopic methods and by some chemical transformations. While the diterpenes isolated are widespread in the genus Solidago, the sesquiterpenes have not been obtained before from any species. The overall picture of the large genus, however, is relatively uniform.     

2α-iso-Valeroyloxyeperuic acid,a diterpene from Eupatorium petiolare

The diterpene acid 2α-iso-valeroyloxyeperuic acid was isolated from the aerial parts of Eupatorium petiolare. Its structure and stereochemist     

Four new labdane diterpene oxides from Sideritis gomerae

Four new labdane diterpene oxides gomeraidehyde, 13-epigomeraldehyde, gomeric acid and 13-epigomeric acid as well as eperu-13-ene-8β,15-diol were isolated from the aerial part of Sideritis gomerae.     

Diterpenoids from Viguiera insignis

The isolation of several known diterpenoids and one new diterpene diol from aerial parts of Viguiera insignis is reported.     

Terpenoids from Wedelia buphthalmiflora

A series of known di- and triterpenoids were characterized in the whole plant of Wedelia buphthaimiflora.     

Cinnamoylgrandifloric acid from Mikania oblongifolia

Isolation of the cinnamate of grandifloric acid from Mikania oblongifolia is reported.     

Genkwadaphnin,a potent antileukemic diterpene from Daphne genkwa

In vivo P-388 assay-directed fractionation of an active extract of Daphne genkwa (Yuán Huā) has led to the isolation and characterization of a new antileukemic principle. genkwadaphnin.