Piperazinoethyl-N-(2,3-dimethyl-5-oxo-1-phenyl-3{66 -pyrazolin-4-yl)carbamates

摘要

Compounds of the formula: <IMAGE> in which R represents a group of the formula: <IMAGE> in which n represents an integer of 1 to 5 and R1 and R2, which may be the same or different, each represents a hydrogen atom or a linear or branched, saturated or unsaturated aliphatic hydrocarbon group containing 1 to 5 carbon atoms, or R1 and R2, together with the nitrogen atom to which they are attached, form a heterocyclic ring having 5 to 7 ring members, which heterocyclic ring optionally contains a second hetero-atom and/or one or more substituent groups, and their pharmaceutically acception acid addition salts, which compounds and salts are particularly suitable for use as analgesics.