| abstract |
A novel amino acid derivative represented by general formula (I) and a salt thereof have been synthesized and it has been found that they promote the growth and physiological action of the T cells of mammals and have an immunomodulator effect and either an antitumor or a carcinostatic effect, and that they also have the effect of promoting the growth of hematopoietic stem cells wherein Y represents 0 or 1; R1 represents unsusbstituted C¿1?-C8 alkyl, etc.; R?2¿ represents hydrogen, C¿1?-C5 alkyl, etc.; R?3¿ represents hydrogen, C¿1?-C8 alkyl, etc.; R?4¿ represents hydrogen, C¿1?-C3 alkyl, etc.; and R?5¿ represents -OR?42, -NR43R44¿, etc. |