Yoshikazu Wada

Pfaffic acid, a novel nortriterpene from Pfaffia paniculata Kuntze

Abstract Pfaffic acid, C29H44O3, a new nortriterpene which exerts inhibitory effects on the growth of cultured tumor cells, was isolated from the roots of Pfaffia aniculata Kuntze and the structure established.

The X-ray analysis of tolypomycinone tri-m-bromobenzoate

Bestimmung der Molekularstruktur des Tolypomycinones durch Röntgenstrukturanalyse seinerm-Bromobenzoat-Kristalle. Die auf chemischem Wege aufgeklärte Konstitution wird bestätigt und darÜber hinaus Klärung Über Konfiguration und Konformation des Tolypomycin Y erreicht.

Opposite chirality of pillaromycin A to tetracyclines: the X-ray analysis of Achromycin hydrochloride.

Durch Röntgen-Strukturanalyse wurde die absolute Konfiguration des Antibiotikums Achromycin ermittelt. Sie ist zu derjenigen des verwandten, aus Kulturen vonStreptomyces flavovirens stammenden Pillaromycins A entgegengesetzt.

Molecular conformation of thyrotropin-releasing hormone from the X-ray structural analysis of its tartrate

An X-ray crystal study of thyrotropin-releasing hormone tartrate has revealed that its molecular structure, in contrast with predictions based on energy calculations and n.m.r. spectroscopic studies, contains an extended peptide bond stabilized by a hydrogen bond between the π-NH unit of histidine and the carbonyl oxygen of the proline amide.

X-Ray crystal structure of (E,E)-[2.4]paracyclophane-1,17-diene

The molecular structure of (E,E)-[2.4] paracyclophane-1,17-diene, a unique paracyclophane analogue, was established by an X-ray crystal structure analysis, and found to be of 2/m molecular symmetry with all benzene rings and vinylene groups perpendicular to molecular ring.