| abstract |
The present invention relates to compounds of formula (I) and intermediates for the preparation of compounds of formula (I) wherein X is hydrogen or halogen; R2 is hydrogen, acyl or hydroxyl; R6 is hydrogen or optionally substituted hydroxyl; R13 is hydrogen or optionally substituted alkyl, alkenyl, alkynyl, aryl, heterocyclo; and R is hydrogen or optionally substituted alkyl, alkenyl, alkynyl, aryl or heterocyclo. The compounds can be used as active ingredients in pharmaceutical compositions. SHE |