[1] NCI, Med Chem Lab, CCR, NIH, Frederick, MD 21702 USA
[2] SAIC Frederick, Prot Chem Lab, Adv Technol Program, Frederick, MD 21702 USA
[3] NCI, Urol Oncol Branch, CCR, NIH, Bethesda, MD 20892 USA
[4] NCI, Data Management Serv Inc, Frederick, MD 21702 USA