1. Polymer Chemistry Division, Biomedical Technology Wing, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Satelmond Palace, Poojapura, Trivandrum, Kerala 695 012, India, and Centre d’Etudes Pharmaceutiques, UMR CNRS 8612, Université Paris-Sud, 5 rue J.B. Clément, 92296 Chatenay-Malabry Cedex, France