The present invention relates to compounds of the formula
##STR1##
which are formed during fermentation by the microorganism Coniochaeta ellipsoidea
Udagawa, DSM 13856, or by one of its mutations and/or variants, and chemically
derivatized if appropriate. The invention furthermore relates to a process for
preparing compounds of the formula (I), and to their use as pharmaceuticals. In
addition, the invention relates to the use of a compound of the formula (VI)
##STR2##
for producing a pharmaceutical for the treatment and prophylaxis of degenerative
neuropathics or of Alzheimer's disease.
