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Andr Pichette ; Hongyan Liu ; Christian Roy ; Steve Tanguay; Franois Simard; Serge Lavoie
Selective Oxidation of Betulin for the Preparation of Betulinic Acid, an Antitumoral Compound
Synthetic Communications, Volume 34, Issue 21 December 2004 , pages 3925 - 3937
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http://dx.doi.org/10.1081/SCC-200034788