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Submitted on: 07 April 2011.
Revised on: 08 July 2011.
Accepted on: 01 August 2011.
___________________JOURNAL OF ASIAN NATURAL PRODUCTS RESEARCH
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Submitted on: 25 October 1999.
Revised on: 16 January 2000.
Accepted on: 28 February 2000.
___________________JOURNAL OF ASIAN NATURAL PRODUCTS RESEARCH
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Submitted on: 04 April 2009.
Revised on: 03 May 2009.
Accepted on: 24 June 2009.
___________________JOURNAL OF ASIAN NATURAL PRODUCTS RESEARCH