| 摘要 |
A novel amino acid derivative represented by the general formula (I) shown below or a salt thereof have now been provided by chemical synthesis, and it has been found that these new compounds stimulate proliferation and physiological activities of the T cells of mammals, have an immunomodulating activity and also have an antitumor activity or a carcinostatic activity. It has also been found that these new compounds have an effect of stimulating the proliferation of hematopoietic stem cells.whereiny is 0 or 1;R1 represents an unsubstituted C1-C8 alkyl group or others;R2 represents a hydrogen atom, a C1-C5 alkyl group or others;R3 represents a hydrogen atom, a C1-C8 alkyl group or others;R4 represents a hydrogen atom, a C1-C3 alkyl group or others;R5 represents a group -OR42, a group or others.
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