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Maytansinoids, which have antimitotic, antitumor, antifungal and protozoacidal activity have been produced using DMAP to catalyze esterification reactions. One example is production of

For additional US patent references relating DMAP and maytansinoid synthesis please
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N. Hashimoto, T. Kishi, (Takada Chemical Industries, Ltd.) U.S. 4,137,230.