A new class of macrocyclic diterpenes from Bertyadimerostigma (euphorbiaceae)

Three diterpene acids, representing a new class of bicyclic diterpenes, have been isolated from $\text{Bertya dimerostigma}$ F. Muell. (Euphorbiaceae). Spectroscopic and X-ray cryatallographic evidence for their structure is presented. A rationale for their origin $\text{via}$ modification of the casbane skeleton is given.     

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.     

The sterepolides: new isolactaranes from stereumpurpureum

Sterepolide and dihydrosterepolide, new sesquiterpenes isolated from the fungus $\text{Stereum}$$\text{purpureum}$, are assigned structures $\text{4}$ and $\text{7}$, respectively. The assignments are based mainly on spectroscopic studies and similarities to isolactarorufin ($\text{5}$). A possible mode of biogenesis of these isolactarane type sesquiterpenes is discussed.     

The structure of paraherquamide,a toxic metabolite from penicilliumparaherquei

A new toxic metabolite was isolated from $\text{Penicillium}$$\text{paraherquei}$ and the structure was determined by X-ray diffraction analysis. The metabolite was designated as paraherquamide.     

New tricarbocyclic cycropropanoid diterpenes from the brown alga dictyotadichotoma

The structures $\text{1}$, $\text{2}$, and $\text{3}$ have been proposed for three new diterpenes from $\text{Dictyota}$$\text{dichotoma}$ mainly on the basis of spectroscopic evidence.     

Isolation and structure of clithioneine,a new amino acid betaine from clitocybeacromelalga.

A new amino acid betalne clithioneine was isolated from $\text{Clitocybe}$$\text{acromelalga}$. The structure was determined as $\text{1}$ by spectral analyses and chemical degradations.     

Structures of altiloxins a and b,phytotoxins from phomaasparagi sacc

By spectroscopic data, the structures of two new phytotoxins, altiloxins a and b from Phoma asparagi sacc., the incitant of stem blight disease on asparagus are elucidated.     

A new polyether toxin from Gymnodiniumbreve Davis

A new ichthyotoxic toxin was isolated from the unialgal culture of the deleterious Florida red tide organism, $\text{Gymnodinium}$$\text{breve}$ Davis (Syn. $\text{Ptychodiscus}$$\text{brevis}$), and its structure was elucidated.