1. Department of Pharmaceutical ChemistryFaculty of PharmacyMahidol University Bangkok Thailand
2. Department of Pharmaceutical ChemistryFaculty of PharmacySrinakharinwirot University Nakornnayok Thailand
3. Department of ChemistryUniversity of Kansas Lawrence KS USA
4. Ralph N Adams Institute for Bioanalytical ChemistryUniversity of Kansas Lawrence KS USA
5. University of Kansas Cancer Center Kansas City KS USA