| 摘要 |
PROBLEM TO BE SOLVED: To provide an immunoenhancer having excellent effect. SOLUTION: This immunoenhancer comprises a compound of formula (1) (wherein, R1 is O or the group: NCH2COOH; and R2 is the group: CH(CH2OH) CH2CH2CONH2, CH(CH2OH)CH2CH2COOH, CH2CH2SO3H or COOH) as the active ingredient.
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