1. Department of Chemistry, Drexel University, 3401 Chestnut Street, Philadelphia, Pennsylvania 19104, United States
2. Facultad de Ingeniería, División de Ciencias Básicas, Universidad Nacional Autónoma de México, Ciudad de México 04510, Mexico
3. Angel Pharmaceuticals, 866 Malcolm Rd., Burlingame, California 94010, United States
4. Department of Chemistry, Temple University, 1901 N. 13th St., Philadelphia, Pennsylvania 19122, United States