abstract |
Pharmaceutical compositions containing as an active ingredient a compound of the formula ##STR1## wherein R 1 is methyl, ethyl or propyl, R 2 is hydrogen, methyl or ethyl, n R 3 is hydrogen or methyl, n R 4 is ##STR2## R 5 is hydrogen, methyl or acetyl, or a non-toxic, pharmacologically acceptable acid addition salt thereof; and a method of using the same as analgesics. |