Alpha-lipoic acid with novel modification

US5994393A · kind A · utility

Assignee

• Asta Medica Aktiengesellschaft · DE

Inventors

• Thomas Beisswenger · Radebeul, DE
• Gunter Laban · Dresden, DE
• Karl-Friedrich Landgraf · Dresden, DE
• Eberhard Oestreich · Dresden, DE
• Matthias Rischer · Frankfurt am Main, DE

Key dates

• Filing date: May 8, 1998
• Grant date: Nov 30, 1999
• Expiry date: May 8, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D339/04
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention is relative to a thioctic acid with a predominant amount of an enantiomer and a novel modification, in the case of which the X-ray powder diffractograms show a characteristic reflex in the range of 23.4 to 22.7.degree. 2 theta(Cu) which shifts in the direction of the smaller angular values as the enantiomer content increases.