- New Histidyl amino acid derivatives, and pharmaceutical composition comprising the same
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A compound of the formula: STR1 wherein R1 is lower alkyl optionally substituted with a substituent selected from the group consisting of acyl, hydroxy, lower alkoxy, aryl, lower alkylthio and a group of the formula: STR2 in which R5 is hydrogen or acyl and R6 is hydrogen or lower alkyl; aryl; or amino optionally substituted with substituent(s) selected from the group consisting of lower alkyl and acyl; and R2 is hydrogen or lower alkyl; or R1 and R2 are taken together with the attached nitrogen atom to form a heterocyclic group optionally substituted with substituent(s) selected from the group consisting of lower alkyl, hydroxy(lower )alkyl, lower alkoxy(lower)alkyl, acyl(lower)alkyl, oxo and acyl; R3 is hydrogen or lower alkyl; and R4 is lower alkyl; and its pharmaceutically acceptable salt, processes for the preparation thereof and pharmaceutical composition comprising the same.
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