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Submitted on: 17 December 2000.
Revised on: 27 January 2001.
Accepted on: 25 March 2001.
___________________CURRENT ORGANIC CHEMISTRY---BENTHAM SCIENCE PUBL LTD
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Submitted on: 01 April 2012.
Revised on: 18 June 2012.
Accepted on: 19 July 2012.
___________________CURRENT ORGANIC CHEMISTRY---BENTHAM SCIENCE PUBL LTD