1. The province and ministry co-sponsored collaborative innovation center for medical epigenetics Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics School of Pharmacy Tianjin Medical University Tianjin 300070 P. R. China
2. NMR Spectroscopy group Bijvoet Center for Biomolecular Research Utrecht University Padualaan 8 3584 CH Utrecht The Netherlands
3. Institute of Materials and Environmental Chemistry Hungarian Academy of Sciences and Department of Physics Budapest University of Technology and Economics Budafoki ut 8 1111 Budapest Hungary