3-Cyano-4-isopropoxybenzoic Acid is a useful reagent in the preparation of cyanoaryloxadiazolyl-substituted nitrogen heterocycles as S1P3-sparing agonists of sphingosine phosphate receptors S1P1 and S1P5 for treatment of multiple sclerosis and their pharmacokinetics and side effect profiles. Preparayion and SAR of biaryl oxadiazoles as S1P1 receptor agonists.