| abstract |
(57) [Summary] (Modified) [Objective] To provide compounds useful as immunopotentiators and prophylactic / therapeutic agents for thrombocytopenia. [Structure] General formula I Wherein, R 1 and R 2, at least one substituted carbamoyl group substituted carbamoyl group or an acyl group, R 3 And R 4 are the same or different and are hydrogen or an alkyl group, R 5 is an optionally protected amino group, X is a carbonyl group, a sulfonyl group or the formula —CONH— (C H 2 ) n —NHCO— group (n is an integer of 1 to 10), Y is composed of 1 to 7 amino acids which may have a protecting group, and is bonded via a sulfonic acid amide bond. Or a salt thereof. |