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BIIB129 is a covalent, selective, small molecule inhibitor of Bruton's tyrosine kinase (BTK) capable of penetrating the blood-brain barrier. BIIB129 inhibits the activity of BTK by covalently binding to Cys481 in BTK, thereby affecting the function of B cells and myeloid cells. BIIB129 can be used in multiple sclerosis (MS) research[1].

[1] Himmelbauer M K, et al. Discovery and Preclinical Characterization of BIIB129, a Covalent, Selective, and Brain-Penetrant BTK Inhibitor for the Treatment of Multiple Sclerosis[J]. Journal of Medicinal Chemistry, 2024. DOI:10.1021/acs.jmedchem.4c00220