This is a Randomized Study Comparing Two Doses of INT131 ( 3 mg and 1 mg) Administered Orally (PO) Daily (QD) Versus Placebo 1 Tablet PO QD in Subjects With Treatment-naïve RRMS for ≤ 3 Years

This is a randomized, double-blind, parallel group study comparing two doses of INT131( 3 mg and 1 mg) administered orally (PO) daily (QD) versus placebo 1 tablet PO QD in subjects with treatment-naïve RRMS for ≤ 3 years.. Part 2 of the study is open-label, Subjects completing 6 months of evaluations and study drug in Part 1 without serious study drug-related treatment emergent adverse events (TEAE) will be switched to INT131 1 mg PO QD and followed for an additional 6 months.