1. Faculty of Pharmacy, University of Medicine and Pharmacy of Timisoara, P-ta Eftimie Murgu 3, 1900-Timisoara, Romania, Department Chemistry, University of West, Str. Pestalozzi 16, 1900-Timisoara, Romania, and EST Lead Informatics, AstraZeneca R and D. Mölndal, S-43183 Mölndal, Sweden