The primary objective of the study is to evaluate the safety and tolerability of single oral doses of BIIB068 in healthy participants. Secondary objectives are to characterize the single-oral-dose Pharmacokinetic (PK) of BIIB068 in healthy participants, to determine the effect of food on the single-oral-dose PK of BIIB068 in healthy participants and to examine the effect of administration of the proton pump inhibitor (PPI) esomeprazole on the single-dose PK of BIIB068 in healthy participants.