1 Department of Structural and Chemical Biology, Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Científicas, 28040 Madrid, Spain. Electronic address: dperezsala@cib.csic.es.
2 Mass Spectrometry Center&QOPNA, Department of Chemistry, Department of Chemistry & CESAM& ECOMARE, University of Aveiro, 3810-193 Aveiro, Portugal.