Patents Represented by Attorney Raymond E. Speer

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  • Long-lasting agonists of enkephalin
    Patent number: 4301151
    Abstract: Novel peptides of the formula: ##STR1## wherein X is S or (CH.sub.2).sub.n and n is 0, 1 or 2, and R.sub.1 through R.sub.6 are various amino acid and other substituents; having long-lasting enkephalin agonist activity; useful in treating pain and in treating schizophrenia.
    Type: Grant
    Filed: September 15, 1980
    Date of Patent: November 17, 1981
    Assignee: Merck & Co., Inc.
    Inventors: Daniel F. Veber, Roger M. Freidinger