Opioid derivative
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United States of America Patent
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Jan 4, 2005
Grant Date -
Sep 11, 2003
app pub date -
Jan 29, 2002
filing date -
Jan 29, 2002
priority date (Note) -
Expired
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Abstract
1. A peptide derivative represented by the following formula (1) or a salt thereof; ##STR1## wherein R.sup.1 is hydrogen atom or methyl group, R.sup.2 is hydrogen atom or hydroxy group and n is an integer of 1-8, provided that R.sup.1 is hydrogen atom when R.sup.2 is hydrogen atom, which has specific and high binding affinity with the .mu.-opioid receptor.
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