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Peptides and process for preparing the same

  • US 4,563,306 A
  • Filed: 08/17/1984
  • Issued: 01/07/1986
  • Est. Priority Date: 09/07/1983
  • Status: Expired due to Fees
First Claim
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1. A compound of the formula:

  • ##STR20## wherein A is a group of the formula;

    ##STR21## R1 and R2 are the same or different and each hydrogen atom, nitro, amino, a protected amino, hydroxy or lower alkoxy,Y is oxygen atom or a group of the formula;

    --NR3 --,R3 is hydrogen atom or lower alkyl,X is methylene or sulfur atom and the dotted line is an optional double bond, or a pharmaceutically acceptable acid addition salt thereof.

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