Study to Evaluate the Safety and Efficacy of PIPE-307 in Subjects With Relapsing-Remitting Multiple Sclerosis

Inclusion Criteria: * Subject is fluent in English. * Male or female 18 to 50 years of age, inclusive, at the first Screening visit. * A diagnosis of relapsing-remitting multiple sclerosis (RRMS) according to the 2017 Revised McDonald Criteria. * Expanded Disability Status Scale (EDSS) and retinal nerve fiber layer within protocol requirements. * Stable immunomodulatory treatment on no more than a single DMT for RRMS over the 6 months prior to Screening, as determined by the PI. * Male or female subjects with reproductive potential agree to comply with a highly effective contraceptive method as per protocol through 1 month after last study drug administration as per protocol. * General good medical health with no clinically significant or relevant abnormalities except those attributed to the underlying multiple sclerosis (MS), including medical history, physical exam, vital signs, ECG and laboratory evaluations, as assessed by the Investigator. If enrolled in the visual evoked potential (VEP) sub-study, an additional inclusion criterion includes: \- Screening VEP P100 latency greater than the upper limit of normal (as defined in the protocol) in at least one eye, OR a protocol-defined difference in VEP P100 latency between eyes. Exclusion Criteria: * Diagnosis or history of symptoms of optic neuritis within 9 months prior to Screening in either eye. * Diagnosis of MS more than 10 years prior to Screening. * History of severe myopia, ophthalmologic or retinal disorder tha…