[1] Texas State Univ, Dept Chem & Biochem, San Marcos, TX 78666 USA
[2] Texas State Univ, Dept Chem & Biochem, San Marcos, TX 78681 USA
[3] Univ Texas Austin, Coll Pharm, Div Med Chem, Austin, TX 78712 USA
[4] Univ Texas Austin, Coll Pharm, Inst Mol & Cellular Biol, Austin, TX 78712 USA