| 摘要 |
Compounds of the general formula: <IMAGE> and pharmaceutical acceptable salts thereof wherein R is H, lower alkyl, lower alkenyl, lower aralkenyl, cycloalkyl-alkyl, propargyl, lower aralkyl, hydroxyalkyl and esters thereof, heterocyclic, heterocyclic-alkyl, alkyl-aminoalkyl, adamantylalkyl, aralkyl-heterocyclic-alkyl and alkyl-aralkyl-heterocyclic alkyl; R1 is H, lower alkyl, phenyl, or phenylloweralkyl; R2 is hydrogen or lower alkyl; R3 is hydrogen; lower alkoxy; lower alkoxy alkyl ether of hydroxy; amino; lower alkyl; halogen; nitro; hydroxy; or carboxylic acid ester of hydroxy group, which compounds are useful as analgesics, narcotic antagonists and antihistaminics. |
