JOAQUÃN CAMPOS received B. Sc. and Ph. D. degrees from the University of Granada. He is now full Professor in Organic and Medicinal Chemistry. He has been working with Professor Ganellin, co-inventor of the drug cimetidine (Tagamet), at University College London. His research interests include the synthesis, reactivity and conformational analysis of seven-membered cycloacetals, antimetabolite prodrugs, the effects of anticancer agents on signal transduction pathways and K+-channel blockers. He is currently teaching Medicinal Chemistry at the Faculty of Pharmacy of the University of Granada (Spain).