To study on the 10-deacetyl baccatin III extract from the leaves and branches of Taxus mairei. A new method was proposed to extract and purify 10-DAB III, which was adopted as the parent nucleus of the high efficacious antitumour drug-taxol and docetaxel in the compositive synthesis. Optimization selection was also made in the extraction and purification conditions of taxol. The purity quotient of 10-DAB III obtained via this technics could reach 91%, with the yield above 70%. It has been testified that the technics was feasible in industrial practice.
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