Fortschritte der Chemie Organischer Naturstoffe/Progress in the Chemistry of Organic Natural Products/Progres dans la Chimie des Substances Organiques Naturel?es

Substances belonging to this group of organic compounds are wi,lely distributed in Nature, being found in plants, both higher and lower fungi and, upto the present time, in one animal source, sheep wool-fat. For a long­ time no real differentiation was possible between the tetra- and penta­ cyclic triterpenes and the sterols. Then the two latter became disting­ uishable by their selenium. ·dehydro...