Steroidal antifeedants from the dorid nudibranch Aldisasanguineacooperi

Two steroids, 3-oxo-chol-4-ene-24-oic acid ($\text{2}$) andi ts unsaturated analog $\text{4}$ have been isolated from the dorid nudibranch $\text{Aldisa}$$\text{sanguinea}$$\text{cooperi}$, and the acid $\text{2}$ has been shown to have antifeedant properties.     

Caraibical,a new aromatic sesquiterpene from the marine alga laurenciacaraibica

Caraibical, a new aromatic sesquiterpene aldehyde, has been isolated from the marine marine red alga $\text{Laurencia}$$\text{caraibica}$. The structure, which possesses an ether cyclization differing from previous compounds, was defined on the basis of its spectral data.     

Two novel sesterterpene hydroxyquinols from the sponge microcionatoxistyla

The structures of two unique sesterpenes, toxislylide A and B, have been deduced by chemical, spectral, and x-ray crystallographic studies. They are components of the sponge $\text{Microciona}$$\text{toxistyla}$.     

Aflavinine,a novel indole-mevalonate metabolite from tremorgen-producing aspergillusflavus species

The structure of aflavanine, a new diterpene indole from $\text{A}$. $\text{flavus}$, is presented.     

Brunfelsamidine: a novel convulsant from the medicinal plant brunfelsiagrandiflora

A convulsant isolated from $\text{Brunfelsia grandiflora}$ is identified as pyrrole-3-carbox-amidine.     

New highly oxidized fusicoccane diterpenoids from the liverwort plagiochilaacanthophylla subsp. japonica

Four novel fusicoccane diterpenoids, fusicoplagins A, B, C, and D, have been isolated from the liverwort $\text{Plagiochila}$$\text{acanthophylla}$ subsp. $\text{japonica}$ and the structures determined by spectroscopic methods, chemical transformations, and X-ray crystallographic analysis.     

Stereocontrolled (E,Z and erythro, threo) synthesis of ⊙-hydroxyallylic sulphides

All four isomers of substituted 3-alkylthio-4-hydroxybutenes have been synthesised: both the geometry of the double bond and the relative stereochemistry of the two chiral centres are controlled.     

Engleromycin,a new cytochalasan from Engleromycesgoetzei Hennings

The structure of engleromycin isolated from $\text{Engleromyces}$$\text{goetzei}$ Hennings has been established as $\text{1}$ by spectral techniques.     

Structures of xestospongin A,B,C and D,novel vasodilativecompounds from marine sponge, xestospongiaexigua

Xestospongin A,B,C and D represent a new class of macrocyclic 1-oxaquinolizidines, have been isolated from Australian sponge $\text{Xestospongia}$$\text{exigua}$. The structure of xestospongin C has been determined by X-ray analysis.