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Maytansinoids

  • US 4,322,348 A
  • Filed: 05/14/1980
  • Issued: 03/30/1982
  • Est. Priority Date: 06/05/1979
  • Status: Expired due to Term
First Claim
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1. A compound of the formula:

  • ##STR12## wherein R represents --CO--CH3, --CO--CH2 --CH3, ##STR13##

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