Monamidocin, a Novel Fibrinogen Receptor Antagonist. I. Production, Isolation, Characterization and Structural Elucidation.

Tetrafibricin, a novel fibrinogen receptor antagonist. II. Structural elucidation.

The structure of tetrafibricin, a novel and potent fibrinogen receptor antagonist isolated from the culture broth of Streptomyces neyagawaensis NR0577, was determined. Tetrafibricin has a unique structure containing primary amine, conjugated tetraenoic acid, and polyhydroxy functionalities that is biosynthetically related to the polyene macrolide antibiotics.

ISOLATION AND STRUCTURAL ELUCIDATION OF THE FIRST KNOWN C-HOMOPROTOBERBERINE

A novel C-homoprotoberberine alkaloid, Hediamine (2), has been isolated from the roots of Berberis actinucantha (Berberidaceae). Conclusive proof for the structure of hediamine was obtained by its comparison with the isomeric lactam (4), by chemical transformation, and by means of spectroscopic techniques (UV, IR, MS, NMR).

Fermentation, Isolation, Structural Elucidation and Biological Activities

A fermentation broth of an unidentified fungus (N983-46) was found to produce DNAgyrase inhibitors, CJ-12,371 (1) and CJ-12,372 (2). Following isolation by solvent extraction and silica gel and ODS(reverse phase) chromatographies, the structures were determined to be novel spiro-ketal compounds with S-connguration at position C-l. CJ-12,371 and CJ-12,372 inhibit both DNA supercoiling and relaxa...

Cochinmicins, novel and potent cyclodepsipeptide endothelin antagonists from a Microbispora sp. I. Production, isolation, and characterization.

Cochinmicins I, II, III are novel peptolides produced in submerged-fermentation cultures of Microbispora sp. ATCC 55140. These closely related compounds are separated by HPLC and are novel competitive endothelin antagonists. Cochinmicins II and III are stereoisomeric to each other. Cochinmicin I is the deschloro analog of cochinmicin III.

isolation and structural elucidation of natural products in euphorbia erythradenia