1. MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006, P. R. China
2. Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, USA
3. Department of Dermatology, The Eastern Division of the First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, 510275, P. R. China