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Submitted on: 15 May 2000.
Revised on: 13 July 2000.
Accepted on: 08 August 2000.
___________________JOURNAL OF MEDICINAL CHEMISTRY
Submitted on: 11 May 1999.
Revised on: 07 July 1999.
Accepted on: 13 August 1999.
___________________JOURNAL OF MEDICINAL CHEMISTRY