Oblon, Fisher, Spivak, McClelland & Maier
N-Acylpeptide compound, processes for the preparation thereof and the pharmaceutical compositions
 This invention relates to new N-acylpeptide compounds of immunological activity, said compounds being of the formula: ##EQU1## wherein R.sup.1 and R.sup.2 are each alkyl or alkenyl; PA1 R.sup.3 is hydrogen, lower alkyl, hydroxy(lower)alkyl, heterocyclic(lower)alkyl or ar(lower)alkyl, wherein the aryl moiety may have hydroxy or protected hydroxy; PA1 R.sup.4 is carboxy, esterified carboxy, carboxy(lower)alkyl or esterified carboxy(lower)alkyl; PA1 X is bond or lower alkylene; PA1 Y is lower alkylene or lower alkylidene; and PA1 n is an integer of 0 to 1; or its pharmaceutically acceptable salt. 
Fujisawa Pharmaceutical Co., Ltd.
A C A A A
A61P C07K A61P A61K A61P
inventional inventional inventional additional inventional
Kazuyoshi Itsuo Keizo Masanobu Hiroshi Hirokazu
Umehara Uchida Yoshida Kohsaka Imanaka Tanaka