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filingDate 1997-04-03-04:00^^<http://www.w3.org/2001/XMLSchema#date>
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publicationDate 1998-10-08-04:00^^<http://www.w3.org/2001/XMLSchema#date>
publicationNumber DE-19713768-A1
titleOfInvention Production of betulinic acid
abstract Preparation of betulinic acid (i.e. 3 beta -hydroxy-lup-20(29)-en-28-oic acid; (I)) from the bark of the plane tree, Platanus acerifolia, comprises: (a) extraction of the bark with a medium polarity solvent; (b) concentration of the extract; and (c) recrystallisation of the resulting (I).
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