Methods of making esters of camptothecins

Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...

Reexamination Certificate

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C546S047000

Reexamination Certificate

active

07928235

ABSTRACT:
Methods of preparing CPT-esters are described. The methods include using at least one acid in the esterification reactions or acylation reactions of camptothecins.

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U.S. Appl. No. 11/923,727, filed Oct. 25, 2007, Zhisong Cao.

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