1. Instituto de Química, Universidad Nacional Autónoma de México (UNAM), Circuito Exterior, Ciudad Universitaria, Delegación Coyoacán C.P. 0.4510, Mexico City, Mexico
2. Manchester Institute of Biotechnology, Univ. of Manchester, 131 Princess Street, Manchester, M1 7DN, UK
3. Instituto de Química, Universidade Estadual de Campinas (UNICAMP), CP 6154, Campinas, SP, CEP 13.083-970, Brazil
4. Department of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, UK