The invention relates to compounds of general formula (I) wherein R is (C1-C7)alkyl, (C2-C7)alkenyl or (C2-C7)alkynyl； wherein R is substituted with R1； and pharmaceutically acceptable salts, hydrates, or solvates thereof, for use -alone or in combination with one or more other pharmaceutically active compounds- in therapy, for preventing, treating or ameliorating diseases or conditions responsive to stimulation of neutrophil oxidative burst, responsive to stimulation of keratinocyte IL-8 release or responsive to induction of necrosis.
