Novel cyclic aminophenylacetic acid derivative, production therof, and immune response modulator containing the same as active ingredient

Abstract From the Canadian patent

The present invention provides novel cyclic aminophenylacetic acid derivatives having modulating action on immune response, their optical isomers their salts and their, preparative processes and therapeutic agents for autoimmune, diseases containing them as effective ingredients the cyclic, aminophenylacetic acid derivatives being represented by a general formula (1), wherein R and R1 each independently denotes hydrogen atom or lower alkyl group having 1 to 3 carbon atoms R2 denotes a, phenyl group (which may be substituted with 1 to 3 groups of halogen atom, methoxy group or their combinations) or trifluoromethyl group, and X denotes a hydrogen atom lower, alkyl group having 1 to 3 carbon …