Compounds of the formula: ##STR1## in which R represents an ethyl or isopropyl group, and their addition salts with acids or quaternary ammonium salts can be prepared from the compounds: ##STR2## in which R has the same meaning as above, and are valuable as analgesics.
分子式为##STR1##的化合物,其中R代表乙基或异丙基基团,它们与酸或季
铵盐的加成盐可以从化合物##STR2##中制备,其中R具有与上述相同的含义,并且它们是有价值的镇痛剂。