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Submitted on: 26 November 2011.
Revised on: 08 March 2012.
Accepted on: 27 March 2012.
___________________JOURNAL OF ASIAN NATURAL PRODUCTS RESEARCH
Submitted on: 17 July 2010.
Revised on: 25 September 2010.
Accepted on: 10 October 2010.
___________________JOURNAL OF ASIAN NATURAL PRODUCTS RESEARCH
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Submitted on: 10 October 2003.
Revised on: 07 December 2003.
Accepted on: 18 January 2004.
___________________JOURNAL OF ASIAN NATURAL PRODUCTS RESEARCH