1. Department
of Chemistry, University of Sheffield, Dainton Building, Brook Hill, Sheffield S3 7HF, U.K.
2. Department
of Molecular Biology and Biotechnology, University of Sheffield, Firth Court, Western Bank, Sheffield S10 2TN, U.K.
3. Departamento
de Química, CICECO and Secção Autónoma
de Ciências da Saúde, Universidade de Aveiro, 3810-193 Aveiro, Portugal