A potent S1P1 receptor agonist (IC50s = 6, >10,000, 2,068, 1,956, and 142 nM for S1P1-S1P5, respectively, in a radioligand binding assay); selectively activates S1P1 in a GTPγS assay (EC50s = 5.7, >10,000, 105, 1,108, 59.1 nM, for S1P1-S1P5, respectively); reduces the number of circulating lymphocytes in rats in a dose-dependent manner; reduces edema, protein extravasation, neutrophil activity, and skin levels of the proinflammatory cytokines IL-1β, IL-6, IFN-γ, and TNF-α in a mouse model of delayed-type hypersensitivity; prevents footpad swelling in a rat model of adjuvant-induced arthritis ,