1. Molecular Neuropharmacology Section, NINDS, NIH, 35 Convent Drive, Room 3A201, Bethesda, MD 20892, USA.
2. Computational Chemistry and Molecular Biophysics Unit, NIDA, NIH, TRIAD Technology Center, 333 Cassell Drive, Room 1121, Baltimore, MD 21224, USA.
3. Basic Pharmaceutical Sciences, High Point University, One University Parkway, High Point, NC 27268, USA.