1. Department
of Pharmaceutical Sciences, University of Maryland School of Pharmacy, 20 Penn Street, Baltimore, Maryland 21201, United States
2. Naval Research Laboratory, Code 6930, 4555 Overlook Avenue, Washington,
D.C. 20375, United States
3. Department
of Chemistry and Biochemistry, University of Maryland College Park, College
Park, Maryland 20740, United States
4. Department
of Pharmaceutical Engineering, School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, China