Buprenorphine analgesic analogues
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United States of America Patent
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Dec 15, 1998
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N/A
app pub date -
May 21, 1997
filing date -
May 28, 1996
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Expired
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Abstract
The object of this invention is to provide novel buprenorphine analgesic analogues represented by following formula(I) and their non-toxic pharmaceutically acceptable salts. ##STR1## wherein R.sub.1 is hydrogen atom, methyl, ethyl, cyclopropyl or cyclobutyl; and R.sub.2 is cyclopropyl or cyclobutyl.
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