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Submitted on: 13 December 2009.
Revised on: 29 March 2010.
Accepted on: 23 April 2010.
___________________JOURNAL OF NATURAL PRODUCTS---AMER CHEMICAL SOC
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Submitted on: 09 May 2010.
Revised on: 30 July 2010.
Accepted on: 25 September 2010.
___________________JOURNAL OF NATURAL PRODUCTS---AMER CHEMICAL SOC
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