1. Institute
for Bio-Organic Chemistry “Antonio González”,
Center for Biomedical Research of the Canary Islands (CIBICAN), Department
of Organic Chemistry, University of La Laguna, 38206 La Laguna, Tenerife, Spain
2. Centre
for Drug Research, Division of Pharmaceutical Biosciences, Faculty
of Pharmacy, University of Helsinki, P.O. Box 56, FI-00014 Helsinki, Finland