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Submitted on: 31 October 2011.
Revised on: 02 January 2012.
Accepted on: 02 March 2012.
___________________JOURNAL OF NATURAL PRODUCTS---AMER CHEMICAL SOC
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Submitted on: 23 October 2009.
Revised on: 10 January 2010.
Accepted on: 30 January 2010.
___________________JOURNAL OF NATURAL PRODUCTS---AMER CHEMICAL SOC
Submitted on: 27 November 2009.
Revised on: 27 January 2010.
Accepted on: 03 March 2010.
___________________JOURNAL OF NATURAL PRODUCTS---AMER CHEMICAL SOC
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