[1] NCI, Med Chem Lab, Ctr Canc Res, NIH,NCI Frederick, Frederick, MD 21702 USA
[2] Russian Acad Med Sci, VN Orekhovich Inst Biomed Chem, Lab Struct Funct Based Drug Design, Moscow 119121, Russia
[3] Univ Erlangen Nurnberg, Inst Organ Chem, D-91052 Erlangen, Germany
[4] Univ Erlangen Nurnberg, Comp Chem Ctr, D-91052 Erlangen, Germany