| abstract |
(57) [Summary] [Structure] 1) General formula [Chemical formula 1] [Wherein R 1 : H; carboxyl group protecting groups R 2 and R 3 : optionally substituted C 6 -C 20 alkanoyl group R 4 : H; optionally substituted benzyl group; substituted Optionally a phenyl group R 5 : H; a hydroxyl-protecting group n: 1 to 18] and salts thereof. [Effect] The above compound (I) has an excellent macrophage activating effect or macrophage activity suppressing effect, a compound having the former effect is an immunostimulant or an antitumor agent, and a compound having the latter effect is an antitumor agent. It is extremely useful as an inflammatory agent, anti-autoimmune disease agent or immunosuppressant. |