The present invention relates to novel hydroxyphenylundecane derivatives of the formula (I), ##STR00001## a method for the preparation of said compounds by cultivation of the fungus Cryphonectria parasitica, DSM 14453, and their use as pharmaceuticals, i.e. for the treatment of Alzheimer's Disease, Parkinson's Disease, Huntington's Diseases, stroke, psychosis and/or depressions.