| 摘要 |
[Problem to be Solved] An immunostimulant highly safe and administrable for a long period of time as well as a pharmaceutical composition containing the immunostimulant as an active ingredient and drink or food products for immunostimulation are developed and provided. [Solution] An immunostimulant containing a compound represented by the following general formula (I) or a pharmaceutically acceptable salt thereof as an active ingredient is provided. R1 is a hydrogen atom or a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, R2 to R5 are independently a hydrogen atom, or a substituted or unsubstituted lower alkyl or lower acyl group, X is—(CH2)2—,—(CH2)3—,—(CH2)4—,—CO—CH2—,—CO—(CH2)2—,—CO—(CH2)3—,—CH2—CO—CH2—,—CO—O—CH2—,—CO—O—(CH2)2—,—O—CO—CH2—,—O—CO—(CH2)2—,—CH2—O—CH2—,—CH2—O—(CH2)2—,—O—CH2—,—O—(CH2)2—,—O—(CH2)3—,—NHY—CO—CH2—,—NHYCO—(CH2)2—,—CO—NHY—CH2—or—CO—NHY—(CH2)2—, Y herein is a hydrogen atom or a lower alkyl group.
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