Abstract: An optically active or racemic fused pyrimidine derivative of the formula I ##STR1## has pharmaceutical activity in decreasing serum lipids, cholesterol deposits and, in general, against atherosclerosis.

Abstract: A process for the preparation of fermentation media suitable for culturing yeast for animal consumption and microspores and/or for the production of protein from vegetable waste matter. Any vegetable matter containing a considerable amount of hemicelluloses, pentosans, pectins or other polysaccharides in addition to cellulose and not very suitable for direct feeding of animals is usable as starting material. Preferred representatives are: corn-cob and/or stalks, reeds, sunflower stalks, fallen autumn leaves. An animal food product made by the method is also disclosed.