Tetrapeptidehydrazide derivatives
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United States of America Patent
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Jul 7, 1981
Issued Date -
N/A
app pub date -
Oct 31, 1979
filing date -
Apr 23, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Novel tetrapeptidehydrazide derivatives, inclusive of a pharmacologically acceptable acid addition salt thereof, which has the general formula (I): ##STR1## [wherein R.sub.1 is hydrogen or lower alkyl; R.sub.2 is hydrogen or the side chain of a D-.alpha.-amino acid; R.sub.3 is hydrogen or lower alkyl; R.sub.4 is hydrogen, or a saturated or unsaturated and straight or branched lower aliphatic acyl group which may optionally be substituted by hydroxy, amino, lower alkoxy, halogen, oxo, lower alkylthio or lower alkylthiooxide], are useful as analgesics.
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