WK-5344A substance, WK-5344B substance and methods for producing them

摘要

The present invention relates to novel substance having inhibitory action on cholesteryl ester transfer protein, WK-5344A substance and WK-5344B substance, and process for production thereof. A microorganism belonging to genus Streptomyces having ability to produce WK-5344A substance and WK-5344B substance is cultured in a medium, and the WK-5344A substance and the WK-5344B substance are accumulated in the medium, then the WK-5344A substance and the WK-5344B substance are isolated from the said medium. Since the present substance shows significant inhibitory action on cholesteryl ester transfer protein, the substance is effective for prevention and treatment of diseases caused by accumulation of cholesterol in human.